diff --git a/pyqtgraph/graphicsItems/ImageItem.py b/pyqtgraph/graphicsItems/ImageItem.py
index 50cef315..479f4917 100644
--- a/pyqtgraph/graphicsItems/ImageItem.py
+++ b/pyqtgraph/graphicsItems/ImageItem.py
@@ -491,7 +491,9 @@ class ImageItem(GraphicsObject):
             if stepData.dtype.kind in "ui":
                 # For integer data, we select the bins carefully to avoid aliasing
                 step = np.ceil((mx-mn) / 500.)
-                bins = np.arange(mn, mx+1.01*step, step, dtype=np.int)
+                bins = []
+                if step > 0.0:
+                    bins = np.arange(mn, mx+1.01*step, step, dtype=np.int)
             else:
                 # for float data, let numpy select the bins.
                 bins = np.linspace(mn, mx, 500)