diff --git a/src/pathops/SkOpCoincidence.cpp b/src/pathops/SkOpCoincidence.cpp
index 87bb913869..f56847787c 100755
--- a/src/pathops/SkOpCoincidence.cpp
+++ b/src/pathops/SkOpCoincidence.cpp
@@ -110,11 +110,17 @@ bool SkOpCoincidence::addExpanded(SkChunkAlloc* allocator
                 if (startPart < oStartPart) {
                     double newT = oStartPtT->fT + oStartRange * startPart;
                     newPt = oStart->segment()->addT(newT, SkOpSegment::kAllowAlias, allocator);
+                    if (!newPt) {
+                        return false;
+                    }
                     newPt->fPt = test->pt();
                     test->ptT()->addOpp(newPt);
                 } else {
                     double newT = startPtT->fT + startRange * oStartPart;
                     newPt = start->segment()->addT(newT, SkOpSegment::kAllowAlias, allocator);
+                    if (!newPt) {
+                        return false;
+                    }
                     newPt->fPt = oTest->pt();
                     oTest->ptT()->addOpp(newPt);
                 }
diff --git a/src/pathops/SkOpSegment.cpp b/src/pathops/SkOpSegment.cpp
index 3b81cf2eed..d066794cee 100644
--- a/src/pathops/SkOpSegment.cpp
+++ b/src/pathops/SkOpSegment.cpp
@@ -362,6 +362,9 @@ SkOpPtT* SkOpSegment::addT(double t, AllowAlias allowAlias, SkChunkAlloc* alloca
         }
         if (t < result->fT) {
             SkOpSpan* prev = result->span()->prev();
+            if (!prev) {
+                return nullptr;
+            }
             SkOpSpan* span = insert(prev, allocator);
             span->init(this, prev, t, pt);
             this->debugValidate();
diff --git a/tests/PathOpsSimplifyTest.cpp b/tests/PathOpsSimplifyTest.cpp
index a4a33eb68c..70835d7e8a 100644
--- a/tests/PathOpsSimplifyTest.cpp
+++ b/tests/PathOpsSimplifyTest.cpp
@@ -5055,11 +5055,24 @@ path.close();
     REPORTER_ASSERT(reporter, !Simplify(path, &path));
 }
 
+static void fuzz_59(skiatest::Reporter* reporter, const char* filename) {
+    SkPath path;
+path.moveTo(SkBits2Float(0x430c0000), SkBits2Float(0xce58f41c));  // 140, -9.09969e+08f
+path.lineTo(SkBits2Float(0x43480000), SkBits2Float(0xce58f419));  // 200, -9.09969e+08f
+path.lineTo(SkBits2Float(0x42200000), SkBits2Float(0xce58f41b));  // 40, -9.09969e+08f
+path.lineTo(SkBits2Float(0x43700000), SkBits2Float(0xce58f41b));  // 240, -9.09969e+08f
+path.lineTo(SkBits2Float(0x428c0000), SkBits2Float(0xce58f419));  // 70, -9.09969e+08f
+path.lineTo(SkBits2Float(0x430c0000), SkBits2Float(0xce58f41c));  // 140, -9.09969e+08f
+path.close();
+    REPORTER_ASSERT(reporter, !Simplify(path, &path));
+}
+
 static void (*skipTest)(skiatest::Reporter* , const char* filename) = 0;
 static void (*firstTest)(skiatest::Reporter* , const char* filename) = 0;
 static void (*stopTest)(skiatest::Reporter* , const char* filename) = 0;
 
 static TestDesc tests[] = {
+    TEST(fuzz_59),
     TEST(fuzz_twister2),
     TEST(fuzz_twister),
     TEST(fuzz994s_3414),