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@@ -184,7 +184,11 @@ class ExerciseLink extends AbstractLink
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$sessionId = $this->get_session_id();
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$courseId = $this->getCourseId();
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$exerciseData = $this->get_exercise_data();
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- $exerciseId = $exerciseData['id'];
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+ $exerciseId = isset($exerciseData['id']) ? $exerciseData['id'] : 0;
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+
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+ if (empty($exerciseId)) {
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+ return null;
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+ }
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$exercise = new Exercise($courseId);
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$exercise->read($exerciseData['id']);
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