diff --git a/apps/graph/cartesian_function_store.cpp b/apps/graph/cartesian_function_store.cpp
index 917efcdb8..46a2cfc07 100644
--- a/apps/graph/cartesian_function_store.cpp
+++ b/apps/graph/cartesian_function_store.cpp
@@ -57,6 +57,7 @@ void CartesianFunctionStore::removeFunction(Shared::Function * f) {
   for (int j = i; j<m_numberOfFunctions; j++) {
     m_functions[j] = m_functions[j+1];
   }
+  m_functions[m_numberOfFunctions] = CartesianFunction("", KDColorBlack);
 }
 
 int CartesianFunctionStore::maxNumberOfFunctions() {
diff --git a/apps/sequence/sequence_store.cpp b/apps/sequence/sequence_store.cpp
index 2c118e5be..ea4df6f29 100644
--- a/apps/sequence/sequence_store.cpp
+++ b/apps/sequence/sequence_store.cpp
@@ -50,6 +50,7 @@ void SequenceStore::removeFunction(Shared::Function * f) {
   for (int j = i; j<m_numberOfFunctions; j++) {
     m_sequences[j] = m_sequences[j+1];
   }
+  m_sequences[m_numberOfFunctions] = Sequence("", KDColorBlack);
 }
 
 int SequenceStore::maxNumberOfFunctions() {