diff --git a/src/pathops/SkOpCoincidence.cpp b/src/pathops/SkOpCoincidence.cpp
index fabcadf31a..375cb978df 100755
--- a/src/pathops/SkOpCoincidence.cpp
+++ b/src/pathops/SkOpCoincidence.cpp
@@ -490,6 +490,7 @@ bool SkOpCoincidence::addExpanded(DEBUG_COIN_DECLARE_ONLY_PARAMS()) {
                         walk = walk->upCast()->next();
                     } while (!(walkOpp = walk->ptT()->contains(oSeg))
                             && walk != coin->coinPtTEnd()->span());
+                    FAIL_IF(!walkOpp);
                     nextT = walk->t();
                     oNextT = walkOpp->fT;
                 }
diff --git a/tests/PathOpsOpTest.cpp b/tests/PathOpsOpTest.cpp
index 1cc9ac4226..a37595c2d5 100644
--- a/tests/PathOpsOpTest.cpp
+++ b/tests/PathOpsOpTest.cpp
@@ -7948,7 +7948,44 @@ path.conicTo(SkBits2Float(0x7f52753a), SkBits2Float(0x8072ffff), SkBits2Float(0x
     testPathOpFuzz(reporter, path1, path2, (SkPathOp) 3, filename);
 }
 
+static void fuzz763_45(skiatest::Reporter* reporter, const char* filename) {
+    SkPath path;
+    path.setFillType((SkPath::FillType) 0);
+
+    SkPath path1(path);
+    path.reset();
+    path.setFillType((SkPath::FillType) 0);
+path.moveTo(SkBits2Float(0x00000000), SkBits2Float(0x00000000));  // 0, 0
+path.cubicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x7a303030), SkBits2Float(0x7a303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 2.28705e+35f, 2.28705e+35f, 6.40969e-10f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x74303030), SkBits2Float(0x74303030), SkBits2Float(0x30303030), SkBits2Float(0x74303030));  // 6.40969e-10f, 5.58363e+31f, 5.58363e+31f, 6.40969e-10f, 5.58363e+31f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f
+path.moveTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f
+path.moveTo(SkBits2Float(0x77773030), SkBits2Float(0x30303030));  // 5.01357e+33f, 6.40969e-10f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x7a743030), SkBits2Float(0x74303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 3.16974e+35f, 5.58363e+31f, 6.40969e-10f
+path.lineTo(SkBits2Float(0x77773030), SkBits2Float(0x30303030));  // 5.01357e+33f, 6.40969e-10f
+path.close();
+path.moveTo(SkBits2Float(0x77773030), SkBits2Float(0x30303030));  // 5.01357e+33f, 6.40969e-10f
+path.lineTo(SkBits2Float(0x7f303030), SkBits2Float(0x7a303030));  // 2.34194e+38f, 2.28705e+35f
+path.conicTo(SkBits2Float(0x77303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0xf9303030), SkBits2Float(0x7a303030));  // 3.57352e+33f, 6.40969e-10f, 6.40969e-10f, -5.71764e+34f, 2.28705e+35f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f
+path.quadTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f
+path.quadTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x7a303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 2.28705e+35f, 6.40969e-10f
+path.cubicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x7a303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 2.28705e+35f, 6.40969e-10f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 6.40969e-10f
+path.moveTo(SkBits2Float(0x77303030), SkBits2Float(0xff303030));  // 3.57352e+33f, -2.34194e+38f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x7f773030), SkBits2Float(0x7a7a3030), SkBits2Float(0x7a303030));  // 6.40969e-10f, 6.40969e-10f, 3.2857e+38f, 3.24763e+35f, 2.28705e+35f
+path.quadTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x77303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 3.57352e+33f, 6.40969e-10f
+path.conicTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x7b303030), SkBits2Float(0x73303030), SkBits2Float(0x30303030));  // 6.40969e-10f, 6.40969e-10f, 9.14822e+35f, 1.39591e+31f, 6.40969e-10f
+path.quadTo(SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x30303030), SkBits2Float(0x7a7a3030));  // 6.40969e-10f, 6.40969e-10f, 6.40969e-10f, 3.24763e+35f
+
+    SkPath path2(path);
+    testPathOpFuzz(reporter, path1, path2, (SkPathOp) 3, filename);
+}
+
 static struct TestDesc failTests[] = {
+    TEST(fuzz763_45),
     TEST(fuzz763_44),
     TEST(fuzz763_43),
     TEST(fuzz763_42),