update

Author: fredericcarre

src/configuration/apiCommunicationUtils.ts

@@ -32,9 +32,20 @@ function normalizeTopic(
   }
 
   if (Array.isArray(topic)) {
-    const normalized = topic.map((t): Topic => ({ value: t._ ?? t.value ?? t.type ?? '' }));
+    const normalized = topic.map((t): Topic => ({
+      value: typeof t._ === 'string' ? t._ :
+             typeof t.value === 'string' ? t.value :
+             typeof t.type === 'string' ? t.type :
+             ''
+    }));
+    
     return normalized.length > 0 ? [normalized[0]] : [{ value: '' }];
   }
 
-  return [{ value: topic._ ?? topic.value ?? topic.type ?? '' }];
+  return [{
+    value: typeof topic._ === 'string' ? topic._ :
+           typeof topic.value === 'string' ? topic.value :
+           typeof topic.type === 'string' ? topic.type :
+           ''
+  }];
 }