diff --git a/fhem/FHEM/01_FHEMWEB.pm b/fhem/FHEM/01_FHEMWEB.pm
index aab78c10e..73a8aa283 100644
--- a/fhem/FHEM/01_FHEMWEB.pm
+++ b/fhem/FHEM/01_FHEMWEB.pm
@@ -76,6 +76,7 @@ use vars qw($FW_wname);   # Web instance
 use vars qw($FW_subdir);  # Sub-path in URL, used by FLOORPLAN/weblink
 use vars qw(%FW_pos);     # scroll position
 use vars qw($FW_cname);   # Current connection name
+use vars qw($FW_chash);   # client fhem hash
 use vars qw(%FW_hiddenroom); # hash of hidden rooms, used by weblink
 use vars qw($FW_plotmode);# Global plot mode (WEB attribute), used by SVG
 use vars qw($FW_plotsize);# Global plot size (WEB attribute), used by SVG
@@ -120,7 +121,6 @@ my $FW_XHR;        # Data only answer, no HTML
 my $FW_id="";      # id of current page
 my $FW_jsonp;      # jasonp answer (sending function calls to the client)
 my $FW_headerlines; #
-my $FW_chash;      # client fhem hash
 my $FW_encoding="UTF-8";
 my $FW_styleStamp=time();
 my %FW_svgData;
diff --git a/fhem/FHEM/98_SVG.pm b/fhem/FHEM/98_SVG.pm
index bb27323a5..59cf33dbb 100644
--- a/fhem/FHEM/98_SVG.pm
+++ b/fhem/FHEM/98_SVG.pm
@@ -13,6 +13,7 @@ sub FW_pO(@);
 use vars qw($FW_ME);      # webname (default is fhem), needed by 97_GROUP
 use vars qw($FW_RET);     # Returned data (html)
 use vars qw($FW_RETTYPE); # image/png or the like
+use vars qw($FW_chash);   # client fhem hash
 use vars qw($FW_cssdir);  # css directory
 use vars qw($FW_detail);  # currently selected device for detail view
 use vars qw($FW_dir);     # base directory for web server
@@ -2445,7 +2446,8 @@ plotAsPng(@)
   @webs=devspec2array("TYPE=FHEMWEB");
   foreach(@webs) {
     if(!InternalVal($_,'TEMPORARY',undef)) {
-      $FW_wname=InternalVal($_,'NAME','');
+      $FW_wname = InternalVal($_,'NAME','');
+      $FW_chash = $defs{$FW_wname};
       last;
     }
   }