diff --git a/src/build_models/meinhardtplugin.cpp b/src/build_models/meinhardtplugin.cpp
--- a/src/build_models/meinhardtplugin.cpp
+++ b/src/build_models/meinhardtplugin.cpp
@@ -35,7 +35,8 @@ bool batch = false;
 
 // To be executed after cell division
 void MeinhardtPlugin::OnDivide(ParentInfo *parent_info, CellBase *daughter1, CellBase *daughter2) {
-	
+  parent_info = NULL;
+  daughter1 = daughter2 = NULL;
 }
 
 void MeinhardtPlugin::SetCellColor(CellBase *c, QColor *color) { 
@@ -104,6 +105,7 @@ void MeinhardtPlugin::CelltoCellTranspor
 }
 
 void MeinhardtPlugin::WallDynamics(Wall *w, double *dw1, double *dw2) {
+  w = NULL;
 	for (int c = 0;c<NChem();c++) {
 		dw1[c] = 0.; dw2[c] = 0.;
     }