diff --git a/gm/twopointradial.cpp b/gm/twopointradial.cpp
index e2b06ec..b87f896 100644
--- a/gm/twopointradial.cpp
+++ b/gm/twopointradial.cpp
@@ -50,6 +50,9 @@
 
     SkISize onISize() { return skiagm::make_isize(480, 725); }
 
+    // BUG: PDF code (at least on mac) fails when we run this
+    virtual uint32_t onGetFlags() const SK_OVERRIDE { return kSkipPDF_Flag; }
+
     virtual void onDraw(SkCanvas* canvas) {
         if (false) {
             SkPaint paint;
diff --git a/src/effects/SkGradientShader.cpp b/src/effects/SkGradientShader.cpp
index 6de820b..9945ca1 100644
--- a/src/effects/SkGradientShader.cpp
+++ b/src/effects/SkGradientShader.cpp
@@ -1981,6 +1981,11 @@
             return false;
         }
 
+        // For now, we might have divided by zero, so detect that
+        if (0 == fDiffRadius) {
+            return false;
+        }
+
         // we don't have a span16 proc
         fFlags &= ~kHasSpan16_Flag;
         return true;