diff --git a/src/Logic/Tags/And.ts b/src/Logic/Tags/And.ts
index 86dab36702..5e242b9b6b 100644
--- a/src/Logic/Tags/And.ts
+++ b/src/Logic/Tags/And.ts
@@ -14,6 +14,10 @@ export class And extends TagsFilter {
     constructor(and: TagsFilter[]) {
         super()
         this.and = and
+        if(and.some(p => typeof p === "string")){
+            console.error("Assertion failed: invalid subtags:", and)
+            throw "Assertion failed: invalid subtags found"
+        }
     }
 
     public static construct(and: TagsFilter[]): TagsFilter