diff --git a/outputview/outputexecutejob.cpp b/outputview/outputexecutejob.cpp
--- a/outputview/outputexecutejob.cpp
+++ b/outputview/outputexecutejob.cpp
@@ -227,7 +227,8 @@
     if (d->m_filteringStrategy != OutputModel::NoFilter) {
         model()->setFilteringStrategy(d->m_filteringStrategy);
     } else {
-        model()->setFilteringStrategy(d->m_filteringStrategyPtr.take());
+        d->m_filteringStrategyPtr.reset(nullptr);
+        model()->setFilteringStrategy(OutputModel::NoFilter);
     }
 
     setDelegate( new OutputDelegate );
diff --git a/outputview/outputmodel.cpp b/outputview/outputmodel.cpp
--- a/outputview/outputmodel.cpp
+++ b/outputview/outputmodel.cpp
@@ -76,6 +76,7 @@
     void changeFilterStrategy( KDevelop::IFilterStrategy* newFilterStrategy )
     {
         m_filter = QSharedPointer<IFilterStrategy>( newFilterStrategy );
+        Q_ASSERT(m_filter);
     }
 
     void addLines( const QStringList& lines )
@@ -433,12 +434,14 @@
     }
     Q_ASSERT(filter);
 
+    Q_ASSERT(filter);
     QMetaObject::invokeMethod(d->worker, "changeFilterStrategy",
                               Q_ARG(KDevelop::IFilterStrategy*, filter));
 }
 
 void OutputModel::setFilteringStrategy(IFilterStrategy* filterStrategy)
 {
+    Q_ASSERT(filterStrategy);
     QMetaObject::invokeMethod(d->worker, "changeFilterStrategy",
                               Q_ARG(KDevelop::IFilterStrategy*, filterStrategy));
 }