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-rw-r--r--libcrystfel/src/image-hdf5.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/image-hdf5.c b/libcrystfel/src/image-hdf5.c
index 653057eb..3ba2178a 100644
--- a/libcrystfel/src/image-hdf5.c
+++ b/libcrystfel/src/image-hdf5.c
@@ -152,6 +152,8 @@ int *read_dim_parts(const char *ev_orig, int *pn_dvals)
char *start;
int done;
+ if ( ev_orig == NULL ) ev_orig = "//";
+
/* Valid event ID? (Just the part after //, please) */
ev = strstr(ev_orig, "//");
if ( ev == NULL ) return NULL;