diff --git a/lib/pc_patch_dimensional.c b/lib/pc_patch_dimensional.c
index 1e50cf3..f2bf82a 100644
--- a/lib/pc_patch_dimensional.c
+++ b/lib/pc_patch_dimensional.c
@@ -293,6 +293,7 @@ PCPATCH_DIMENSIONAL *
 pc_patch_dimensional_from_pointlist(const PCPOINTLIST *pdl)
 {
 	PCPATCH_UNCOMPRESSED *patch = pc_patch_uncompressed_from_pointlist(pdl);
+	if ( ! patch ) return NULL;
 	PCPATCH_DIMENSIONAL *dimpatch = pc_patch_dimensional_from_uncompressed(patch);
 	pc_patch_uncompressed_free(patch);
 	return dimpatch;
diff --git a/lib/pc_patch_uncompressed.c b/lib/pc_patch_uncompressed.c
index 1949ab4..4c3d533 100644
--- a/lib/pc_patch_uncompressed.c
+++ b/lib/pc_patch_uncompressed.c
@@ -39,6 +39,7 @@ pc_patch_uncompressed_to_string(const PCPATCH_UNCOMPRESSED *patch)
 			if ( ! pc_point_get_double_by_index(pt, j, &d))
 			{
 				pcerror("%s: unable to read double at index %d", __func__, j);
+				return NULL;
 			}
 			if ( j )
 			{