diff --git a/src/core/SkGpuBlurUtils.cpp b/src/core/SkGpuBlurUtils.cpp
index a1b5b20..c3d4b24 100644
--- a/src/core/SkGpuBlurUtils.cpp
+++ b/src/core/SkGpuBlurUtils.cpp
@@ -321,6 +321,13 @@
             SkRect domain = SkRect::Make(*contentRect);
             domain.inset((i < scaleFactorX) ? SK_ScalarHalf + SK_ScalarNearlyZero : 0.0f,
                          (i < scaleFactorY) ? SK_ScalarHalf + SK_ScalarNearlyZero : 0.0f);
+            // Ensure that the insetting doesn't invert the domain rectangle.
+            if (domain.fRight < domain.fLeft) {
+                domain.fLeft = domain.fRight = SkScalarAve(domain.fLeft, domain.fRight);
+            }
+            if (domain.fBottom < domain.fTop) {
+                domain.fTop = domain.fBottom = SkScalarAve(domain.fTop, domain.fBottom);
+            }
             auto fp = GrTextureDomainEffect::Make(std::move(src),
                                                   SkMatrix::I(),
                                                   domain,