diff --git a/src/modules/partition/core/PartitionIterator.cpp b/src/modules/partition/core/PartitionIterator.cpp
index 097e8d4aa..df1a2e4d7 100644
--- a/src/modules/partition/core/PartitionIterator.cpp
+++ b/src/modules/partition/core/PartitionIterator.cpp
@@ -83,6 +83,7 @@ PartitionIterator::operator!=( const PartitionIterator& other ) const
 PartitionIterator
 PartitionIterator::begin( Device* device )
 {
+    Q_ASSERT(device);
     PartitionTable* table = device->partitionTable();
     if ( !table )
         return PartitionIterator( nullptr );