diff --git a/components/number.inc b/components/number.inc
index ca6f2bf..46af359 100644
--- a/components/number.inc
+++ b/components/number.inc
@@ -432,58 +432,60 @@ function _webform_analysis_number($component, $sids = array(), $single = FALSE)
     }
 
     // Build normal distribution table rows.
-    $count = array();
-    $percent = array();
-    $limit = array();
-    $index = 0;
-
-    $count[] = 0;
-    $limit[] = $average - ($stddev * 4);
-    foreach ($population as $value) {
-      while ($value >= $limit[$index]) {
-        $percent[] = number_format($count[$index] / $population_count * 100, 2, '.', '');
-        $limit[] = $limit[$index] + $stddev;
-        $index += 1;
-        if ($limit[$index] == $average) {
-          $limit[$index] = $limit[$index] + $stddev;
+    if (!empty($stddev)) {
+      $count = array();
+      $percent = array();
+      $limit = array();
+      $index = 0;
+
+      $count[] = 0;
+      $limit[] = $average - ($stddev * 4);
+      foreach ($population as $value) {
+        while ($value >= $limit[$index]) {
+          $percent[] = number_format($count[$index] / $population_count * 100, 2, '.', '');
+          $limit[] = $limit[$index] + $stddev;
+          $index += 1;
+          if ($limit[$index] == $average) {
+            $limit[$index] = $limit[$index] + $stddev;
+          }
+          $count[$index] = 0;
         }
-        $count[$index] = 0;
+        $count[$index] += 1;
+      }
+      $percent[] = number_format($count[$index] / $population_count * 100, 2, '.', '');
+
+      // Format normal distribution table output.
+      $stddev = _webform_number_format($component, $stddev);
+      $low = _webform_number_format($component, $population[0]);
+      $high = _webform_number_format($component, end($population));
+      foreach($limit as $key => $value) {
+        $limit[$key] = _webform_number_format($component, $value);
       }
-      $count[$index] += 1;
-    }
-    $percent[] = number_format($count[$index] / $population_count * 100, 2, '.', '');
-
-    // Format normal distribution table output.
-    $stddev = _webform_number_format($component, $stddev);
-    $low = _webform_number_format($component, $population[0]);
-    $high = _webform_number_format($component, end($population));
-    foreach($limit as $key => $value) {
-      $limit[$key] = _webform_number_format($component, $value);
-    }
 
-    // Column headings (override potential theme uppercase, e.g. Seven in D7).
-    $header = array(
-      t('Normal Distribution'),
-      array('data' => '-4' . $sigma, 'style' => 'text-transform: lowercase;',),
-      array('data' => '-3' . $sigma, 'style' => 'text-transform: lowercase;',),
-      array('data' => '-2' . $sigma, 'style' => 'text-transform: lowercase;',),
-      array('data' => '-1' . $sigma, 'style' => 'text-transform: lowercase;',),
-      array('data' => '+1' . $sigma, 'style' => 'text-transform: lowercase;',),
-      array('data' => '+2' . $sigma, 'style' => 'text-transform: lowercase;',),
-      array('data' => '+3' . $sigma, 'style' => 'text-transform: lowercase;',),
-      array('data' => '+4' . $sigma, 'style' => 'text-transform: lowercase;',),
-    );
-
-    // Insert row labels.
-    array_unshift($limit, t('Boundary'));
-    array_unshift($count, t('Count'));
-    array_unshift($percent, t('% of !description', array('!description' => $description)));
-
-    $output = theme('table', array('header' => $header, 'rows' => array($limit, $count, $percent)));
-
-    $rows[4] = array(t('Range'), t('!low to !high', array('!low' => $low, '!high' => $high)));
-    $rows[5] = array(t('Standard deviation (!sigma)', array('!sigma' => $sigma)), $stddev);
-    $rows[6] = array(array('data' => $output, 'colspan' => 2));
+      // Column headings (override potential theme uppercase, e.g. Seven in D7).
+      $header = array(
+        t('Normal Distribution'),
+        array('data' => '-4' . $sigma, 'style' => 'text-transform: lowercase;',),
+        array('data' => '-3' . $sigma, 'style' => 'text-transform: lowercase;',),
+        array('data' => '-2' . $sigma, 'style' => 'text-transform: lowercase;',),
+        array('data' => '-1' . $sigma, 'style' => 'text-transform: lowercase;',),
+        array('data' => '+1' . $sigma, 'style' => 'text-transform: lowercase;',),
+        array('data' => '+2' . $sigma, 'style' => 'text-transform: lowercase;',),
+        array('data' => '+3' . $sigma, 'style' => 'text-transform: lowercase;',),
+        array('data' => '+4' . $sigma, 'style' => 'text-transform: lowercase;',),
+      );
+
+      // Insert row labels.
+      array_unshift($limit, t('Boundary'));
+      array_unshift($count, t('Count'));
+      array_unshift($percent, t('% of !description', array('!description' => $description)));
+
+      $output = theme('table', array('header' => $header, 'rows' => array($limit, $count, $percent)));
+
+      $rows[4] = array(t('Range'), t('!low to !high', array('!low' => $low, '!high' => $high)));
+      $rows[5] = array(t('Standard deviation (!sigma)', array('!sigma' => $sigma)), $stddev);
+      $rows[6] = array(array('data' => $output, 'colspan' => 2));
+    }
   }
 
   return $rows;