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-rw-r--r--src/gui_merge.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/gui_merge.c b/src/gui_merge.c
index 44bf2846..ae94fd30 100644
--- a/src/gui_merge.c
+++ b/src/gui_merge.c
@@ -268,6 +268,8 @@ gint merge_sig(GtkWidget *widget, struct crystfelproject *proj)
int i;
struct new_merging_job_params *njp;
+ if ( proj->merging_opts != NULL ) return FALSE;
+
njp = malloc(sizeof(struct new_merging_job_params));
if ( njp == NULL ) return FALSE;