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-rw-r--r--libcrystfel/src/events.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcrystfel/src/events.c b/libcrystfel/src/events.c
index 60727341..3062871d 100644
--- a/libcrystfel/src/events.c
+++ b/libcrystfel/src/events.c
@@ -622,6 +622,7 @@ struct dim_structure *default_dim_structure()
void free_dim_structure(struct dim_structure *hsd)
{
+ if ( hsd == NULL ) return;
free(hsd->dims);
free(hsd);
}