diff --git a/Models/ThemeConfig/Json/TagRenderingConfigJson.ts b/Models/ThemeConfig/Json/TagRenderingConfigJson.ts
index ab4552534..f700548ae 100644
--- a/Models/ThemeConfig/Json/TagRenderingConfigJson.ts
+++ b/Models/ThemeConfig/Json/TagRenderingConfigJson.ts
@@ -8,7 +8,7 @@ export interface TagRenderingConfigJson {
 
     /**
      * The id of the tagrendering, should be an unique string.
-     * Used to keep the translations in sync
+     * Used to keep the translations in sync. Only used in the tagRenderings-array of a layerConfig, not requered otherwise
      */
     id?: string,
     
diff --git a/Models/ThemeConfig/LayerConfig.ts b/Models/ThemeConfig/LayerConfig.ts
index ee8c836fe..410c8b5ad 100644
--- a/Models/ThemeConfig/LayerConfig.ts
+++ b/Models/ThemeConfig/LayerConfig.ts
@@ -275,7 +275,14 @@ export default class LayerConfig {
         }
 
         this.tagRenderings = trs(json.tagRenderings, false);
+        
+       const missingIds = json.tagRenderings.filter(tr => typeof tr !== "string" && tr["builtin"] === undefined && tr["id"] === undefined);
 
+       if(missingIds.length > 0){
+           console.error("Some tagRenderings of", this.id, "are missing an id:", missingIds)
+           throw "Missing ids in tagrenderings"
+       }
+       
         this.filters = (json.filter ?? []).map((option, i) => {
             return new FilterConfig(option, `${context}.filter-[${i}]`)
         });
diff --git a/Models/ThemeConfig/TagRenderingConfig.ts b/Models/ThemeConfig/TagRenderingConfig.ts
index af092e462..4edd0da1d 100644
--- a/Models/ThemeConfig/TagRenderingConfig.ts
+++ b/Models/ThemeConfig/TagRenderingConfig.ts
@@ -13,7 +13,7 @@ import {Utils} from "../../Utils";
  */
 export default class TagRenderingConfig {
 
-    readonly id?: string;
+    readonly id: string;
     readonly render?: Translation;
     readonly question?: Translation;
     readonly condition?: TagsFilter;
@@ -57,6 +57,7 @@ export default class TagRenderingConfig {
             return;
         }
 
+        
         this.id = json.id ?? "";
         this.render = Translations.T(json.render, context + ".render");
         this.question = Translations.T(json.question, context + ".question");
diff --git a/assets/themes/openwindpowermap/openwindpowermap.json b/assets/themes/openwindpowermap/openwindpowermap.json
index b82db0942..a437a06bd 100644
--- a/assets/themes/openwindpowermap/openwindpowermap.json
+++ b/assets/themes/openwindpowermap/openwindpowermap.json
@@ -63,6 +63,7 @@
       },
       "tagRenderings": [
         {
+          "id": "turbine-output",
           "render": {
             "en": "The power output of this wind turbine is {generator:output:electricity}.",
             "fr": "La puissance générée par cette éolienne est de {generator:output:electricity}."
@@ -77,6 +78,7 @@
           }
         },
         {
+          "id": "turbine-operator",
           "render": {
             "en": "This wind turbine is operated by {operator}.",
             "fr": "Cette éolienne est opérée par {operator}."
@@ -90,6 +92,7 @@
           }
         },
         {
+          "id": "turbine-height",
           "render": {
             "en": "The total height (including rotor radius) of this wind turbine is {height} metres.",
             "fr": "La hauteur totale, incluant les pales, est de {height} mètres."
@@ -104,6 +107,7 @@
           }
         },
         {
+          "id": "turbine-diameter",
           "render": {
             "en": "The rotor diameter of this wind turbine is {rotor:diameter} metres.",
             "fr": "Le diamètre du rotor est de {rotor:diameter} mètres."
@@ -118,6 +122,7 @@
           }
         },
         {
+          "id": "turbine-start-date",
           "render": {
             "en": "This wind turbine went into operation on/in {start_date}.",
             "fr": "L’éolienne est active depuis {start_date}."
diff --git a/assets/themes/speelplekken/speelplekken.json b/assets/themes/speelplekken/speelplekken.json
index 14e03b4d9..3ad9693d7 100644
--- a/assets/themes/speelplekken/speelplekken.json
+++ b/assets/themes/speelplekken/speelplekken.json
@@ -166,11 +166,13 @@
       },
       "tagRenderings": [
         {
+          "id": "walk-length",
           "render": {
             "nl": "Deze wandeling is <b>{_length:km}km</b> lang"
           }
         },
         {
+          "id":"walk-type",
           "mappings": [
             {
               "if": "route=iwn",
@@ -199,6 +201,7 @@
           ]
         },
         {
+          "id": "walk-description",
           "render": {
             "nl": "<h3>Korte beschrijving:</h3>{description}"
           },
@@ -209,6 +212,7 @@
           }
         },
         {
+          "id": "walk-operator",
           "question": {
             "nl": "Wie beheert deze wandeling en plaatst dus de signalisatiebordjes?"
           },
@@ -218,6 +222,7 @@
           }
         },
         {
+          "id": "walk-operator-email",
           "question": {
             "nl": "Naar wie kan men emailen bij problemen rond signalisatie?"
           },
diff --git a/assets/themes/speelplekken/speelplekken_temp.json b/assets/themes/speelplekken/speelplekken_temp.json
deleted file mode 100644
index 867298215..000000000
--- a/assets/themes/speelplekken/speelplekken_temp.json
+++ /dev/null
@@ -1,283 +0,0 @@
-{
-  "id": "speelplekken_temp",
-  "title": {
-    "nl": "Speelplekken in de Antwerpse Zuidrand"
-  },
-  "shortDescription": {
-    "nl": "Speelplekken in de Antwerpse Zuidrand"
-  },
-  "description": {
-    "nl": "Speelplekken in de Antwerpse Zuidrand. Een project van Provincie Antwerpen, in samenwerking met Createlli, Sportpret en OpenStreetMap België"
-  },
-  "language": [
-    "nl"
-  ],
-  "maintainer": "MapComplete",
-  "icon": "./assets/themes/speelplekken/logo.svg",
-  "hideFromOverview": true,
-  "lockLocation": true,
-  "version": "0",
-  "startLat": 51.17174,
-  "startLon": 4.449462,
-  "startZoom": 12,
-  "widenFactor": 0.05,
-  "socialImage": "",
-  "defaultBackgroundId": "CartoDB.Positron",
-  "layers": [
-    {
-      "builtin": "play_forest",
-      "override": {
-        "source": {
-          "geoJson": "https://pietervdvn.github.io/speelplekken_cache/speelplekken_{z}_{x}_{y}.geojson",
-          "geoJsonZoomLevel": 14,
-          "isOsmCache": true
-        },
-        "icon": "./assets/themes/speelplekken/speelbos.svg",
-        "minzoom": 12
-      },
-      "calculatedTags": [
-        "_is_shadowed=feat.overlapWith('shadow').length > 0 ? 'yes': ''"
-      ]
-    },
-    {
-      "builtin": "playground",
-      "override": {
-        "icon": "./assets/themes/speelplekken/speeltuin.svg",
-        "minzoom": 14,
-        "source": {
-          "geoJsonLocal": "http://127.0.0.1:8080/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJson": "https://pietervdvn.github.io/speelplekken_cache/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJsonZoomLevel": 14,
-          "isOsmCache": true
-        },
-        "calculatedTags": [
-          "_is_shadowed=feat.overlapWith('shadow').length > 0 ? 'yes': ''"
-        ]
-      }
-    },
-    {
-      "builtin": "village_green",
-      "override": {
-        "icon": "./assets/themes/speelplekken/speelweide.svg",
-        "minzoom": 14,
-        "source": {
-          "geoJsonLocal": "http://127.0.0.1:8080/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJson": "https://pietervdvn.github.io/speelplekken_cache/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJsonZoomLevel": 14,
-          "isOsmCache": true
-        },
-        "calculatedTags": [
-          "_is_shadowed=feat.overlapWith('shadow').length > 0 ? 'yes': ''"
-        ]
-      }
-    },
-    {
-      "builtin": "grass_in_parks",
-      "override": {
-        "icon": "./assets/themes/speelplekken/speelweide.svg",
-        "minzoom": 14,
-        "source": {
-          "geoJsonLocal": "http://127.0.0.1:8080/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJson": "https://pietervdvn.github.io/speelplekken_cache/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJsonZoomLevel": 14,
-          "isOsmCache": true
-        },
-        "calculatedTags": [
-          "_is_shadowed=feat.overlapWith('shadow').length > 0 ? 'yes': ''"
-        ]
-      }
-    },
-    {
-      "builtin": "sport_pitch",
-      "override": {
-        "minzoom": 15,
-        "source": {
-          "geoJsonLocal": "http://127.0.0.1:8080/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJson": "https://pietervdvn.github.io/speelplekken_cache/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJsonZoomLevel": 14,
-          "isOsmCache": true
-        },
-        "calculatedTags": [
-          "_is_shadowed=feat.overlapWith('shadow').length > 0 ? 'yes': ''"
-        ]
-      }
-    },
-    {
-      "builtin": "slow_roads",
-      "override": {
-        "+tagRenderings": [
-          {
-            "question": "Is dit een publiek toegankelijk pad?",
-            "mappings": [
-              {
-                "if": "access=private",
-                "then": "Dit is een privaat pad"
-              },
-              {
-                "if": "access=no",
-                "then": "Dit is een privaat pad",
-                "hideInAnswer": true
-              },
-              {
-                "if": "access=permissive",
-                "then": "Dit pad is duidelijk in private eigendom, maar er hangen geen verbodsborden dus mag men erover"
-              }
-            ]
-          }
-        ],
-        "calculatedTags": [
-          "_part_of_walking_routes=Array.from(new Set(feat.memberships().map(r => \"<a href='#relation/\"+r.relation.id+\"'>\" + r.relation.tags.name + \"</a>\"))).join(', ')",
-          "_is_shadowed=feat.overlapWith('shadow').length > 0 ? 'yes': ''"
-        ],
-        "minzoom": 18,
-        "source": {
-          "geoJsonLocal": "http://127.0.0.1:8080/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJson": "https://pietervdvn.github.io/speelplekken_cache/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-          "geoJsonZoomLevel": 14,
-          "isOsmCache": true
-        }
-      }
-    },
-    {
-      "id": "walking_routes",
-      "name": {
-        "nl": "Wandelroutes van provincie Antwerpen"
-      },
-      "description": "Walking routes by 'provincie Antwerpen'",
-      "source": {
-        "osmTags": {
-          "and": [
-            "type=route",
-            "route=foot",
-            "operator~[pP]rovincie Antwerpen"
-          ]
-        },
-        "geoJson": "https://pietervdvn.github.io/speelplekken_cache/speelplekken_{layer}_{z}_{x}_{y}.geojson",
-        "geoJsonZoomLevel": 14,
-        "isOsmCache": true
-      },
-      "title": {
-        "render": "Wandeling <i>{name}</i>",
-        "mappings": [
-          {
-            "if": "name~.*wandeling.*",
-            "then": "{name}"
-          }
-        ]
-      },
-      "tagRenderings": [
-        {
-          "render": {
-            "nl": "Deze wandeling is <b>{_length:km}km</b> lang"
-          }
-        },
-        {
-          "mappings": [
-            {
-              "if": "route=iwn",
-              "then": {
-                "nl": "Dit is een internationale wandelroute"
-              }
-            },
-            {
-              "if": "route=nwn",
-              "then": {
-                "nl": "Dit is een nationale wandelroute"
-              }
-            },
-            {
-              "if": "route=rwn",
-              "then": {
-                "nl": "Dit is een regionale wandelroute"
-              }
-            },
-            {
-              "if": "route=lwn",
-              "then": {
-                "nl": "Dit is een lokale wandelroute"
-              }
-            }
-          ]
-        },
-        {
-          "render": {
-            "nl": "<h3>Korte beschrijving:</h3>{description}"
-          },
-          "question": "Geef een korte beschrijving van de wandeling (max 255 tekens)",
-          "freeform": {
-            "key": "description",
-            "type": "text"
-          }
-        },
-        {
-          "question": {
-            "nl": "Wie beheert deze wandeling en plaatst dus de signalisatiebordjes?"
-          },
-          "render": "Signalisatie geplaatst door {operator}",
-          "freeform": {
-            "key": "operator"
-          }
-        },
-        {
-          "question": {
-            "nl": "Naar wie kan men emailen bij problemen rond signalisatie?"
-          },
-          "render": {
-            "nl": "Bij problemen met signalisatie kan men emailen naar <a href='mailto:{operator:email}'>{operator:email}</a>"
-          },
-          "freeform": {
-            "key": "operator:email",
-            "type": "email"
-          }
-        },
-        "questions",
-        "reviews"
-      ],
-      "color": {
-        "render": "#6d6",
-        "mappings": [
-          {
-            "if": "color~*",
-            "then": "{color}"
-          },
-          {
-            "if": "colour~*",
-            "then": "{colour}"
-          }
-        ]
-      },
-      "width": {
-        "render": "9"
-      }
-    }
-  ],
-  "clustering": {
-    "maxZoom": 16,
-    "minNeededElements": 100
-  },
-  "roamingRenderings": [
-    {
-      "render": "Maakt deel uit van {_part_of_walking_routes}",
-      "condition": "_part_of_walking_routes~*"
-    },
-    {
-      "render": "<a href='{video}' target='blank'>Een kinder-reportage vinden jullie hier<a/>",
-      "freeform": {
-        "key": "video",
-        "type": "url"
-      },
-      "question": "Wat is de link naar de video-reportage?"
-    }
-  ],
-  "overrideAll": {
-    "isShown": {
-      "render": "yes",
-      "mappings": [
-        {
-          "if": "_is_shadowed=yes",
-          "then": "no"
-        }
-      ]
-    }
-  }
-}
\ No newline at end of file