diff --git a/java/compiler/impl/src/com/intellij/packaging/impl/run/BuildArtifactsBeforeRunTaskProvider.java b/java/compiler/impl/src/com/intellij/packaging/impl/run/BuildArtifactsBeforeRunTaskProvider.java
index bfb1aefbefd3..c6826bd53f3f 100644
--- a/java/compiler/impl/src/com/intellij/packaging/impl/run/BuildArtifactsBeforeRunTaskProvider.java
+++ b/java/compiler/impl/src/com/intellij/packaging/impl/run/BuildArtifactsBeforeRunTaskProvider.java
@@ -31,6 +31,7 @@ import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 
 import javax.swing.*;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -93,11 +94,11 @@ public class BuildArtifactsBeforeRunTaskProvider extends BuildArtifactsBeforeRun
 
   public static void setBuildArtifactBeforeRun(@NotNull Project project, @NotNull RunConfiguration configuration, @NotNull Artifact artifact) {
     RunManagerEx runManager = RunManagerEx.getInstanceEx(project);
-    final List<BuildArtifactsBeforeRunTask> buildArtifactsTasks = runManager.getBeforeRunTasks(configuration, ID);
-    if (buildArtifactsTasks.isEmpty()) { //Add new task if absent
+    final List<BuildArtifactsBeforeRunTask> buildArtifactsTasks = new ArrayList<>(runManager.getBeforeRunTasks(configuration, ID));
+    if (runManager.getBeforeRunTasks(configuration, ID).isEmpty()) { //Add new task if absent
       BuildArtifactsBeforeRunTask task = new BuildArtifactsBeforeRunTask(project);
       buildArtifactsTasks.add(task);
-      List<BeforeRunTask> tasks = runManager.getBeforeRunTasks(configuration);
+      List<BeforeRunTask> tasks = new ArrayList<>(runManager.getBeforeRunTasks(configuration));
       tasks.add(task);
       runManager.setBeforeRunTasks(configuration, tasks);
     }