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-rw-r--r--libcrystfel/src/utils.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/utils.c b/libcrystfel/src/utils.c
index a2ba2c60..ba6f44c3 100644
--- a/libcrystfel/src/utils.c
+++ b/libcrystfel/src/utils.c
@@ -469,6 +469,8 @@ char *check_prefix(char *prefix)
char *new;
size_t len;
+ if ( prefix[0] == '\0' ) return prefix;
+
/* Is "prefix" a directory? */
r = stat(prefix, &statbuf);
if ( r != 0 ) {