Error remove multi lines mapping in Database Mapping

[vsc55]

When deleting multiple lines the system fails, and the following Warning appear:

Warning: Illegal string offset 'MappingCaption' in /var/www/html/admin/dbmappings.php on line 194
Warning: Illegal string offset 'MappingInternalID' in /var/www/html/admin/dbmappings.php on line 199
Warning: Illegal string offset 'MappingFieldID' in /var/www/html/admin/dbmappings.php on line 202
Warning: Illegal string offset 'MappingDbFieldName' in /var/www/html/admin/dbmappings.php on line 204
Warning: Illegal string offset 'MappingDbFieldName' in /var/www/html/admin/dbmappings.php on line 205
Warning: Illegal string offset 'colcssclass' in /var/www/html/admin/dbmappings.php on line 209
Warning: Illegal string offset 'COUNTER' in /var/www/html/classes/class_template.php on line 187
Warning: Illegal string offset 'ODDROW' in /var/www/html/classes/class_template.php on line 188
Warning: Illegal string offset 'ROWCNT' in /var/www/html/classes/class_template.php on line 189
Warning: Illegal string offset 'ZAEHLER' in /var/www/html/classes/class_template.php on line 190

Rows initial:

after remove lines:

As seen in the image, the first line removes it without problem but the following ones give an error.