Prevent some common crashes
Prevent some common crashes

simon04/opacclient,johan12345/opacclient,thesebas/opacclient,ruediger-w/opacclient,johan12345/opacclient,opacapp/opacclient,johan12345/opacclient,ruediger-w/opacclient,opacapp/opacclient,thesebas/opacclient,geomcmaster/opacclient,hurzl/opacclient,thesebas/opacclient,johan12345/opacclient,raphaelm/opacclient,opacapp/opacclient,simon04/opacclient,hurzl/opacclient,raphaelm/opacclient,raphaelm/opacclient,opacapp/opacclient,johan12345/opacclient,opacapp/opacclient,geomcmaster/opacclient,ruediger-w/opacclient,ruediger-w/opacclient,simon04/opacclient,hurzl/opacclient,geomcmaster/opacclient,ruediger-w/opacclient