diff --git a/src/effects/gradients/SkGradientShader.cpp b/src/effects/gradients/SkGradientShader.cpp
index 5444c1c..985d459 100644
--- a/src/effects/gradients/SkGradientShader.cpp
+++ b/src/effects/gradients/SkGradientShader.cpp
@@ -840,8 +840,10 @@
     if (!valid_grad(colors, pos, colorCount, mode)) {
         return nullptr;
     }
-    if (start == end && startRadius == endRadius) {
-        return SkShader::CreateEmptyShader();
+    if (startRadius == endRadius) {
+        if (start == end || startRadius == 0) {
+            return SkShader::CreateEmptyShader();
+        }
     }
 
     EXPAND_1_COLOR(colorCount);
diff --git a/src/effects/gradients/SkTwoPointConicalGradient.cpp b/src/effects/gradients/SkTwoPointConicalGradient.cpp
index b938ebd..2209306 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -122,10 +122,10 @@
     // find_quad_roots returns the values sorted, so we start with the last
     float t = roots[countRoots - 1];
     float r = lerp(fRec.fRadius, fRec.fDRadius, t);
-    if (r <= 0) {
+    if (r < 0) {
         t = roots[0];   // might be the same as roots[countRoots-1]
         r = lerp(fRec.fRadius, fRec.fDRadius, t);
-        if (r <= 0) {
+        if (r < 0) {
             return TwoPtRadial::kDontDrawT;
         }
     }