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-rw-r--r--src/pattern_sim.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/pattern_sim.c b/src/pattern_sim.c
index 0c35cc89..bad74615 100644
--- a/src/pattern_sim.c
+++ b/src/pattern_sim.c
@@ -416,6 +416,10 @@ int main(int argc, char *argv[])
RefList *reflections;
reflections = read_reflections(intfile);
+ if (reflections == NULL) {
+ ERROR("Problem reading input file %s\n",intfile);
+ return 1;
+ }
free(intfile);
if ( grad == GRADIENT_PHASED ) {