diff --git a/fhem/FHEM/99_updatefhem.pm b/fhem/FHEM/99_updatefhem.pm
index eb76a1f7b..ab336d470 100644
--- a/fhem/FHEM/99_updatefhem.pm
+++ b/fhem/FHEM/99_updatefhem.pm
@@ -41,34 +41,37 @@ CommandUpdatefhem($$)
   my @commandchain = split(/ +/,$param);
 
   #  Check if the first parameter is "backup"
-  if(uc($commandchain[0]) eq "BACKUP") {
-    my $backupdir = AttrVal("global", "backupdir", "/tmp/FHEM_Backup");
-    # create the backupfolder
-    if(!-d $backupdir) {
-      if(!mkdir($backupdir)) {
-        return "Can't create backup folder $!";
-      }
-    }
-    # full backup, for compatibility, we use the native copy unction, not
-    # dircopy from File::Copy::Recursive
-    if($commandchain[1] eq "") {
-      opendir(IMD, $moddir) || return "Cannot open fhem-module directory";
-      my @files= readdir(IMD);
-      closedir(IMD);
-      my $f;
-
-      foreach $f (@files) {
-        unless ( ($f eq ".") || ($f eq "..") ) {
-          my $ret = copy("$moddir/$f", "$backupdir/$f");
+  if($param) {
+    my @commandchain = split(/ +/,$param);
+    if(uc($commandchain[0]) eq "BACKUP") {
+      my $backupdir = AttrVal("global", "backupdir", "/tmp/FHEM_Backup");
+      # create the backupfolder
+      if(!-d $backupdir) {
+        if(!mkdir($backupdir)) {
+          return "Can't create backup folder $!";
         }
       }
-      $param = "";
+      # full backup, for compatibility, we use the native copy unction, not
+      # dircopy from File::Copy::Recursive
+      if($commandchain[1] eq "") {
+        opendir(IMD, $moddir) || return "Cannot open fhem-module directory";
+        my @files= readdir(IMD);
+        closedir(IMD);
+        my $f;
 
-    } else {
-      # one file backup
-      copy("$moddir/$commandchain[1]", "$backupdir/$commandchain[1]");
-      # recreate $param for further use
-      $param = $commandchain[1];
+        foreach $f (@files) {
+          unless ( ($f eq ".") || ($f eq "..") ) {
+            my $ret = copy("$moddir/$f", "$backupdir/$f");
+          }
+        }
+        $param = "";
+
+      } else {
+        # one file backup
+        copy("$moddir/$commandchain[1]", "$backupdir/$commandchain[1]");
+        # recreate $param for further use
+        $param = $commandchain[1];
+      }
     }
   }