1 files changed, 1 insertions, 1 deletions
diff --git a/src/diagram.cpp b/src/diagram.cpp
index 64ea491..80c85c6 100644
--- a/src/diagram.cpp
+++ b/src/diagram.cpp
@@ -1054,7 +1054,7 @@ void ClassDiagram::writeFigure(FTextStream &output,const char *path,
   p->base.computeExtremes(&baseMaxLabelWidth,&baseMaxX);
   p->super.computeExtremes(&superMaxLabelWidth,&superMaxX);
 
-  uint rows=baseRows+superRows-1;
+  uint rows=QMAX(1,baseRows+superRows-1);
   uint cols=(QMAX(baseMaxX,superMaxX)+gridWidth*2-1)/gridWidth;
 
   // Estimate the image aspect width and height in pixels.