1 files changed, 1 insertions, 1 deletions

diff --git a/cgit.c b/cgit.c
index fd341b8..b3a98c1 100644
--- a/cgit.c
+++ b/cgit.c
@@ -12,25 +12,25 @@
 #include "configfile.h"
 #include "html.h"
 #include "ui-shared.h"
 #include "ui-stats.h"
 #include "scan-tree.h"
 
 const char *cgit_version = CGIT_VERSION;
 
 struct cgit_filter *new_filter(const char *cmd, int extra_args)
 {
         struct cgit_filter *f;
 
-        if (!cmd)
+        if (!cmd || !cmd[0])
                 return NULL;
 
         f = xmalloc(sizeof(struct cgit_filter));
         f->cmd = xstrdup(cmd);
         f->argv = xmalloc((2 + extra_args) * sizeof(char *));
         f->argv[0] = f->cmd;
         f->argv[1] = NULL;
         return f;
 }
 
 void config_cb(const char *name, const char *value)
 {