Add safety to SetInputZoom

Author: MaximDude

Types/GraphicsOutput.bmx

@@ -63,9 +63,11 @@ Type GraphicsOutput
 			m_InputZoom = clampedNewZoom
 			m_TileSize = 24 * m_InputZoom
 
-			m_SourceImageSize = New SVec2I(m_SourceImage.Width, m_SourceImage.Height)
-			DrawImageRect(m_SourceImage, 0, 0, m_SourceImageSize[0] * m_InputZoom, m_SourceImageSize[1] * m_InputZoom) 'Draw the source image to the backbuffer so limb tiles can be created
-			m_LimbManager.CreateLimbParts(m_InputZoom, m_TileSize)
+			If m_SourceImage <> Null Then
+				m_SourceImageSize = New SVec2I(m_SourceImage.Width, m_SourceImage.Height)
+				DrawImageRect(m_SourceImage, 0, 0, m_SourceImageSize[0] * m_InputZoom, m_SourceImageSize[1] * m_InputZoom) 'Draw the source image to the backbuffer so limb tiles can be created
+				m_LimbManager.CreateLimbParts(m_InputZoom, m_TileSize)
+			EndIf
 		EndIf
 		Return m_InputZoom
 	EndMethod