diff --git a/Koha/UI/Form/Builder/Biblio.pm b/Koha/UI/Form/Builder/Biblio.pm
index 340b27b27d..66b4002e81 100644
--- a/Koha/UI/Form/Builder/Biblio.pm
+++ b/Koha/UI/Form/Builder/Biblio.pm
@@ -49,7 +49,9 @@ sub new {
     my ( $class, $params ) = @_;
 
     my $self = {};
-    $self->{biblionumber} = $params->{biblionumber};
+
+    $self->{biblionumber} = $params->{biblionumber} =~ s/\D//gr;
+    # just in case biblionumber obtained from CGI and passed directly here contains weird characters like spaces
 
     bless $self, $class;
     return $self;
diff --git a/cataloguing/addbiblio.pl b/cataloguing/addbiblio.pl
index edd8e77a5e..a776eedae4 100755
--- a/cataloguing/addbiblio.pl
+++ b/cataloguing/addbiblio.pl
@@ -537,6 +537,8 @@ my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
 my $biblio;
 if ($biblionumber){
     $biblio = Koha::Biblios->find($biblionumber);
+    # just in case $biblionumber obtained from CGI contains weird characters like spaces
+    $biblionumber = $biblio->biblionumber if $biblio;
     unless ( $biblio ) {
         $biblionumber = undef;
         $template->param( bib_doesnt_exist => 1 );