Error message

• An error occurred while trying to search with Solr: "400" Status: Bad Request: Bad Request{"error":{"metadata":{"error-class":"org.apache.solr.common.SolrException","root-error-class":"org.apache.solr.common.SolrException"},"msg":"Invalid Number: vereniging","code":400}} .
• Notice: Trying to access array offset on value of type null in omega_pager() (line 30 of /mnt/proj/oej/oej-preprod/profiles/recruiter/themes/omega/omega/theme/pager.theme.inc).
• Notice: Trying to access array offset on value of type null in omega_pager() (line 69 of /mnt/proj/oej/oej-preprod/profiles/recruiter/themes/omega/omega/theme/pager.theme.inc).