diff --git a/src/main/java/org/jenkinsci/plugins/workflow/actions/ErrorAction.java b/src/main/java/org/jenkinsci/plugins/workflow/actions/ErrorAction.java
index 05e286bb..f0dbfa74 100644
--- a/src/main/java/org/jenkinsci/plugins/workflow/actions/ErrorAction.java
+++ b/src/main/java/org/jenkinsci/plugins/workflow/actions/ErrorAction.java
@@ -25,6 +25,7 @@
 package org.jenkinsci.plugins.workflow.actions;
 
 import groovy.lang.MissingMethodException;
+import hudson.remoting.ClassFilter;
 import hudson.remoting.ProxyException;
 import org.codehaus.groovy.control.MultipleCompilationErrorsException;
 import org.jenkinsci.plugins.workflow.graph.AtomNode;
@@ -53,6 +54,19 @@ public ErrorAction(Throwable error) {
      * an equivalent that captures the same details but serializes nicely.
      */
     private boolean isUnserializableException(Throwable error) {
+        if (error == null) {
+            // This shouldn't happen.
+            return false;
+        }
+        try {
+            // Some exceptions are refused to be serialized for security reasons.
+            // (E.g. PowerAssertionError thrown by "assert false")
+            // See also hudson.util.XStream2
+            ClassFilter.DEFAULT.check(error.getClass());
+            ClassFilter.DEFAULT.check(error.getClass().getName());
+        } catch (SecurityException x) {
+            return true;
+        }
         return error instanceof MultipleCompilationErrorsException ||
                error instanceof MissingMethodException;
     }
diff --git a/src/test/java/org/jenkinsci/plugins/workflow/actions/ErrorActionTest.java b/src/test/java/org/jenkinsci/plugins/workflow/actions/ErrorActionTest.java
new file mode 100644
index 00000000..19eaa832
--- /dev/null
+++ b/src/test/java/org/jenkinsci/plugins/workflow/actions/ErrorActionTest.java
@@ -0,0 +1,113 @@
+/*
+ * The MIT License
+ *
+ * Copyright (c) 2016 IKEDA Yasuyuki
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package org.jenkinsci.plugins.workflow.actions;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hamcrest.Matchers;
+import org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition;
+import org.jenkinsci.plugins.workflow.flow.FlowExecution;
+import org.jenkinsci.plugins.workflow.graph.FlowGraphWalker;
+import org.jenkinsci.plugins.workflow.graph.FlowNode;
+import org.jenkinsci.plugins.workflow.job.WorkflowJob;
+import org.jenkinsci.plugins.workflow.job.WorkflowRun;
+import org.junit.ClassRule;
+import org.junit.Rule;
+import org.junit.Test;
+import org.jvnet.hudson.test.BuildWatcher;
+import org.jvnet.hudson.test.Issue;
+import org.jvnet.hudson.test.JenkinsRule;
+
+import hudson.model.Result;
+import hudson.remoting.ProxyException;
+
+/**
+ * Tests for {@link ErrorAction}
+ */
+public class ErrorActionTest {
+    @ClassRule
+    public static BuildWatcher buildWatcher = new BuildWatcher();
+
+    @Rule
+    public JenkinsRule r = new JenkinsRule();
+
+    private List<ErrorAction> extractErrorActions(FlowExecution exec) {
+        List<ErrorAction> ret = new ArrayList<ErrorAction>();
+
+        FlowGraphWalker walker = new FlowGraphWalker(exec);
+        for (FlowNode n : walker) {
+            ErrorAction e = n.getAction(ErrorAction.class);
+            if (e != null) {
+                ret.add(e);
+            }
+        }
+        return ret;
+    }
+
+    @Test
+    public void simpleException() throws Exception {
+        final String EXPECTED = "For testing purpose";
+        WorkflowJob job = r.jenkins.createProject(WorkflowJob.class, "p");
+        job.setDefinition(new CpsFlowDefinition(String.format(
+                "node {\n"
+                        + "throw new Exception('%s');\n"
+                + "}"
+                , EXPECTED
+        )));
+        WorkflowRun b = r.assertBuildStatus(Result.FAILURE, job.scheduleBuild2(0).get());
+        List<ErrorAction> errorActionList = extractErrorActions(b.asFlowExecutionOwner().get());
+        assertThat(errorActionList, Matchers.not(Matchers.empty()));
+        for (ErrorAction e : errorActionList) {
+            assertEquals(Exception.class, e.getError().getClass());
+            assertEquals(EXPECTED, e.getError().getMessage());
+        }
+    }
+
+    @Issue("JENKINS-34488")
+    @Test
+    public void unserializableForSecurityReason() throws Exception {
+        final String FAILING_EXPRESSION = "(2 + 2) == 5";
+        WorkflowJob job = r.jenkins.createProject(WorkflowJob.class, "p");
+        // "assert false" throws org.codehaus.groovy.runtime.powerassert.PowerAssertionError,
+        // which is rejected by remoting.
+        job.setDefinition(new CpsFlowDefinition(String.format(
+                "node {\n"
+                        + "assert %s;\n"
+                + "}",
+                FAILING_EXPRESSION
+        )));
+        WorkflowRun b = r.assertBuildStatus(Result.FAILURE, job.scheduleBuild2(0).get());
+        r.assertLogContains(FAILING_EXPRESSION, b); // ensure that failed with the assertion.
+        List<ErrorAction> errorActionList = extractErrorActions(b.asFlowExecutionOwner().get());
+        assertThat(errorActionList, Matchers.not(Matchers.empty()));
+        for (ErrorAction e : errorActionList) {
+            assertEquals(ProxyException.class, e.getError().getClass());
+        }
+    }
+}