diff --git a/src/main/java/jp/vmi/selenium/selenese/Runner.java b/src/main/java/jp/vmi/selenium/selenese/Runner.java
index e938f4988..45d3a9f0d 100644
--- a/src/main/java/jp/vmi/selenium/selenese/Runner.java
+++ b/src/main/java/jp/vmi/selenium/selenese/Runner.java
@@ -19,6 +19,7 @@
 import org.openqa.selenium.OutputType;
 import org.openqa.selenium.TakesScreenshot;
 import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.WebDriverException;
 import org.openqa.selenium.remote.Augmenter;
 import org.openqa.selenium.remote.RemoteWebDriver;
 import org.slf4j.Logger;
@@ -136,7 +137,7 @@ private TakesScreenshot getTakesScreenshot() {
         }
     }
 
-    private void takeScreenshot(TakesScreenshot tss, File file) {
+    private void takeScreenshot(TakesScreenshot tss, File file) throws WebDriverException {
         file = file.getAbsoluteFile();
         // cf. http://prospire-developers.blogspot.jp/2013/12/selenium-webdriver-tips.html (Japanese)
         driver.switchTo().defaultContent();
@@ -151,7 +152,7 @@ private void takeScreenshot(TakesScreenshot tss, File file) {
     }
 
     @Override
-    public void takeScreenshot(String filename) throws UnsupportedOperationException {
+    public void takeScreenshot(String filename) throws WebDriverException, UnsupportedOperationException {
         TakesScreenshot tss = getTakesScreenshot();
         if (tss == null)
             throw new UnsupportedOperationException("webdriver does not support capturing screenshot.");
@@ -169,7 +170,11 @@ public void takeScreenshotAll(String prefix, int index) {
         if (tss == null)
             return;
         String filename = String.format("%s_%s_%d.png", prefix, FILE_DATE_TIME.format(Calendar.getInstance()), index);
-        takeScreenshot(tss, new File(screenshotAllDir, filename));
+        try {
+            takeScreenshot(tss, new File(screenshotAllDir, filename));
+        } catch (WebDriverException e) {
+            log.warn("- failed to capture screenshot: {} - {}", e.getClass().getSimpleName(), e.getMessage());
+        }
     }
 
     @Override
@@ -180,7 +185,11 @@ public void takeScreenshotOnFail(String prefix, int index) {
         if (tss == null)
             return;
         String filename = String.format("%s_%s_%d_fail.png", prefix, FILE_DATE_TIME.format(Calendar.getInstance()), index);
-        takeScreenshot(tss, new File(screenshotOnFailDir, filename));
+        try {
+            takeScreenshot(tss, new File(screenshotOnFailDir, filename));
+        } catch (WebDriverException e) {
+            log.warn("- failed to capture screenshot: {} - {}", e.getClass().getSimpleName(), e.getMessage());
+        }
     }
 
     /**
diff --git a/src/main/java/jp/vmi/selenium/selenese/result/Error.java b/src/main/java/jp/vmi/selenium/selenese/result/Error.java
index 2e3febc46..26f08a687 100644
--- a/src/main/java/jp/vmi/selenium/selenese/result/Error.java
+++ b/src/main/java/jp/vmi/selenium/selenese/result/Error.java
@@ -18,7 +18,7 @@ private static String getExceptionMessage(Exception e) {
         StringBuilder result = new StringBuilder("Error: ");
         String msg = e.getMessage();
         if (msg != null)
-            result.append(msg);
+            result.append(e.getClass().getSimpleName()).append(" - ").append(msg);
         else
             result.append(e.getClass().getName());
         result.append(" (");