diff --git a/frontend/src/views/social/VocabLessonView.vue b/frontend/src/views/social/VocabLessonView.vue
index bbef6ee..8e42e32 100644
--- a/frontend/src/views/social/VocabLessonView.vue
+++ b/frontend/src/views/social/VocabLessonView.vue
@@ -39,7 +39,7 @@
         </div>
 
         <!-- Wichtige Begriffe aus den Übungen -->
-        <div v-if="importantVocab.length > 0" class="vocab-list">
+        <div v-if="importantVocab && importantVocab.length > 0" class="vocab-list">
           <h4>{{ $t('socialnetwork.vocab.courses.importantVocab') }}</h4>
           <div class="vocab-items">
             <div v-for="(vocab, index) in importantVocab" :key="index" class="vocab-item">
@@ -196,41 +196,52 @@ export default {
     },
     importantVocab() {
       // Extrahiere wichtige Begriffe aus den Übungen
-      if (!this.lesson || !this.lesson.grammarExercises) return [];
-      
-      const vocabMap = new Map();
-      
-      this.lesson.grammarExercises.forEach(exercise => {
-        // Extrahiere aus questionData
-        const qData = this.getQuestionData(exercise);
-        const aData = this.getAnswerData(exercise);
-        
-        if (qData && aData) {
-          // Für Multiple Choice: Extrahiere Optionen und richtige Antwort
-          if (this.getExerciseType(exercise) === 'multiple_choice') {
-            const correct = Array.isArray(aData.correct) ? aData.correct[0] : aData.correct;
-            const question = qData.text || '';
-            
-            // Versuche die Frage zu analysieren (z.B. "Wie sagt man X auf Bisaya?")
-            const match = question.match(/['"]([^'"]+)['"]/);
-            if (match) {
-              const germanWord = match[1];
-              vocabMap.set(correct, { learning: correct, reference: germanWord });
-            } else if (correct) {
-              // Fallback: Verwende die richtige Antwort als Lernwort
-              vocabMap.set(correct, { learning: correct, reference: correct });
-            }
-          }
-          
-          // Für Gap Fill: Extrahiere richtige Antworten
-          if (this.getExerciseType(exercise) === 'gap_fill' && aData.correct) {
-            const correct = Array.isArray(aData.correct) ? aData.correct[0] : aData.correct;
-            vocabMap.set(correct, { learning: correct, reference: correct });
-          }
+      try {
+        if (!this.lesson || !this.lesson.grammarExercises || !Array.isArray(this.lesson.grammarExercises)) {
+          return [];
         }
-      });
-      
-      return Array.from(vocabMap.values());
+        
+        const vocabMap = new Map();
+        
+        this.lesson.grammarExercises.forEach(exercise => {
+          try {
+            // Extrahiere aus questionData
+            const qData = this.getQuestionData(exercise);
+            const aData = this.getAnswerData(exercise);
+            
+            if (qData && aData) {
+              // Für Multiple Choice: Extrahiere Optionen und richtige Antwort
+              if (this.getExerciseType(exercise) === 'multiple_choice') {
+                const correct = Array.isArray(aData.correct) ? aData.correct[0] : aData.correct;
+                const question = qData.text || '';
+                
+                // Versuche die Frage zu analysieren (z.B. "Wie sagt man X auf Bisaya?")
+                const match = question.match(/['"]([^'"]+)['"]/);
+                if (match) {
+                  const germanWord = match[1];
+                  vocabMap.set(correct, { learning: correct, reference: germanWord });
+                } else if (correct) {
+                  // Fallback: Verwende die richtige Antwort als Lernwort
+                  vocabMap.set(correct, { learning: correct, reference: correct });
+                }
+              }
+              
+              // Für Gap Fill: Extrahiere richtige Antworten
+              if (this.getExerciseType(exercise) === 'gap_fill' && aData.correct) {
+                const correct = Array.isArray(aData.correct) ? aData.correct[0] : aData.correct;
+                vocabMap.set(correct, { learning: correct, reference: correct });
+              }
+            }
+          } catch (e) {
+            console.warn('Fehler beim Extrahieren von Vokabeln aus Übung:', e);
+          }
+        });
+        
+        return Array.from(vocabMap.values());
+      } catch (e) {
+        console.error('Fehler in importantVocab computed property:', e);
+        return [];
+      }
     }
   },
   computed: {