diff --git a/seafbackup.sh b/seafbackup.sh
index 3514d2d..d66af2f 100755
--- a/seafbackup.sh
+++ b/seafbackup.sh
@@ -491,6 +491,10 @@ fi
 if [ -z "${sqlPass}" ]; then
     badDetails empty 'sqlPass'
 fi
+# database names
+if [ -z "${ccnetDB_name}" ] || [ -z "${seafileDB_name}" ] || [ -z "${seahubDB_name}" ]; then
+    badDetails empty 'one or more mysql database names'
+fi
 
 ## create tmp directory and generate dumpfile names
 printf "${cyan}[%s] -- [INFO] Dumping SQL databases --${norm}\n" \