diff -r 2f3cc8e045d5 -r 69b8adc9a669 src/glCompiler.cc
--- a/src/glCompiler.cc	Sun Sep 07 01:13:20 2014 +0300
+++ b/src/glCompiler.cc	Sun Sep 07 04:11:55 2014 +0300
@@ -280,12 +280,18 @@
 
 	QVector<GLfloat> vbodata;
 
-	for (auto it = m_objectInfo.begin(); it != m_objectInfo.end(); ++it)
+	for (auto it = m_objectInfo.begin(); it != m_objectInfo.end();)
 	{
 		if (it.key() == null)
+		{
 			it = m_objectInfo.erase (it);
-		elif (it.key().toStrongRef()->document() == CurrentDocument() and not it.key().toStrongRef()->isHidden())
+		}
+		elif (it.key().toStrongRef()->document() == CurrentDocument()
+			and not it.key().toStrongRef()->isHidden())
+		{
 			vbodata += it->data[vbonum];
+			++it;
+		}
 	}
 
 	glBindBuffer (GL_ARRAY_BUFFER, m_vbo[vbonum]);