1diff --git a/third_party/lcms/src/cmsgamma.c b/third_party/lcms/src/cmsgamma.c
2index edb8f6bba..eb3dd881c 100644
3--- a/third_party/lcms/src/cmsgamma.c
4+++ b/third_party/lcms/src/cmsgamma.c
5@@ -799,7 +799,7 @@ void CMSEXPORT cmsFreeToneCurveTriple(cmsToneCurve* Curve[3])
6 // Duplicate a gamma table
7 cmsToneCurve* CMSEXPORT cmsDupToneCurve(const cmsToneCurve* In)
8 {
9-    if (In == NULL) return NULL;
10+    if (In == NULL || In ->Segments == NULL || In ->Table16 == NULL) return NULL;
11
12     return  AllocateToneCurveStruct(In ->InterpParams ->ContextID, In ->nEntries, In ->nSegments, In ->Segments, In ->Table16);
13 }
14