diff --git a/prometeu-compiler/frontends/prometeu-frontend-pbs/src/main/java/p/studio/compiler/pbs/PbsFrontendCompiler.java b/prometeu-compiler/frontends/prometeu-frontend-pbs/src/main/java/p/studio/compiler/pbs/PbsFrontendCompiler.java
index 2a190660..a996f32e 100644
--- a/prometeu-compiler/frontends/prometeu-frontend-pbs/src/main/java/p/studio/compiler/pbs/PbsFrontendCompiler.java
+++ b/prometeu-compiler/frontends/prometeu-frontend-pbs/src/main/java/p/studio/compiler/pbs/PbsFrontendCompiler.java
@@ -248,6 +248,9 @@ public final class PbsFrontendCompiler {
     private void collectCallsFromBlock(
             final PbsAst.Block block,
             final List<PbsAst.CallExpr> output) {
+        if (block == null) {
+            return;
+        }
         for (final var statement : block.statements()) {
             collectCallsFromStatement(statement, output);
         }
@@ -259,6 +262,9 @@ public final class PbsFrontendCompiler {
     private void collectCallsFromStatement(
             final PbsAst.Statement statement,
             final List<PbsAst.CallExpr> output) {
+        if (statement == null) {
+            return;
+        }
         switch (statement) {
             case PbsAst.LetStatement letStatement -> collectCallsFromExpression(letStatement.initializer(), output);
             case PbsAst.AssignStatement assignStatement -> collectCallsFromExpression(assignStatement.value(), output);
@@ -301,6 +307,9 @@ public final class PbsFrontendCompiler {
     private void collectCallsFromExpression(
             final PbsAst.Expression expression,
             final List<PbsAst.CallExpr> output) {
+        if (expression == null) {
+            return;
+        }
         switch (expression) {
             case PbsAst.CallExpr callExpr -> {
                 output.add(callExpr);