diff --git a/src/frontend/syntactic-analysis/bison-actions.c b/src/frontend/syntactic-analysis/bison-actions.c
index 0efc107..be2ad1c 100644
--- a/src/frontend/syntactic-analysis/bison-actions.c
+++ b/src/frontend/syntactic-analysis/bison-actions.c
@@ -74,7 +74,6 @@ void InitializeIntegrate(Integrate * integrate) {
 
 void InitializeDerivative(Derivative * derivative) {
     derivative->function = NULL;
-    derivative->error = NULL;
     derivative->value = NULL;
     derivative->grade = NULL;
 }