1 files changed, 1 insertions, 1 deletions

diff --git a/src/export/extract_version_1.c b/src/export/extract_version_1.c
index ae81dc5..27489ec 100644
--- a/src/export/extract_version_1.c
+++ b/src/export/extract_version_1.c
@@ -73,7 +73,7 @@ void split_to_files( uint8_t *entries, int num_entries )
       char * end = strchr( e, '\t' );
       if( end ) {
         *end = '\n';
-        if( column == 9 ) write( g_state.outfiles[column+1], "0", 1 ); /* Augment Vorwahl */
+        if( column == 9 && *e >= '0' && *e <= '9' ) write( g_state.outfiles[column+1], "0", 1 ); /* Augment Vorwahl */
         write( g_state.outfiles[column+1], e, end - e + 1);
         e = end + 1;
       } else