diff --git a/src/libtomahawk/utils/ImageRegistry.cpp b/src/libtomahawk/utils/ImageRegistry.cpp
index 0ced33387..17e6eb8f3 100644
--- a/src/libtomahawk/utils/ImageRegistry.cpp
+++ b/src/libtomahawk/utils/ImageRegistry.cpp
@@ -57,6 +57,12 @@ ImageRegistry::cacheKey( const QSize& size, float opacity, QColor tint )
 QPixmap
 ImageRegistry::pixmap( const QString& image, const QSize& size, TomahawkUtils::ImageMode mode, float opacity, QColor tint )
 {
+    if ( size.width() < 0 || size.height() < 0 )
+    {
+        Q_ASSERT( false );
+        return QPixmap();
+    }
+
     QHash< qint64, QPixmap > subsubcache;
     QHash< int, QHash< qint64, QPixmap > > subcache;
 
diff --git a/src/libtomahawk/utils/TomahawkUtilsGui.cpp b/src/libtomahawk/utils/TomahawkUtilsGui.cpp
index be45cb725..1fb184c6c 100644
--- a/src/libtomahawk/utils/TomahawkUtilsGui.cpp
+++ b/src/libtomahawk/utils/TomahawkUtilsGui.cpp
@@ -478,6 +478,11 @@ QPixmap
 defaultPixmap( ImageType type, ImageMode mode, const QSize& size )
 {
     QPixmap pixmap;
+    if ( size.width() < 0 || size.height() < 0 )
+    {
+        Q_ASSERT( false );
+        return pixmap;
+    }
 
     switch ( type )
     {