Foxit PDF Reader and PDF Editor code issues vulnerability

Foxit PDF Reader is a PDF reader. Foxit PDF Editor is a PDF editor. Foxit PDF Reader and PDF Editor have a code issue vulnerability that stems from a null pointer reference when this.Span is used by the oState of oStateCollab.addStateModel A null pointer reference exists when this.Span.text is used (because this.Span.text can be NULL). An attacker could exploit this vulnerability to cause a denial of service.