diff --git a/WebContent/js/custom.js b/WebContent/js/custom.js
index e6bb511..c5e7c5f 100644
--- a/WebContent/js/custom.js
+++ b/WebContent/js/custom.js
@@ -36,6 +36,14 @@
                 // save the returnValue in options so that it is available in the callback function
                 optns.returnValue = $frame[0].contentWindow.window.returnValue;
                 optns.onClose();
+                // Remove iframe from DOM so window.frames doesn't accumulate stale entries;
+                // without this, a second showModal call leaves frames[0] pointing to the first
+                // (closed) iframe, causing the previous returnValue to bleed into the next callback.
+                var $dialogEl = $frame.closest('.ui-dialog');
+                setTimeout(function() {
+                    $frame.remove();
+                    if ($dialogEl.length) $dialogEl.remove();
+                }, 0);
 
 				if(optns.option && optns.option.fullScreenPopup){
 					$('iframe[name=topFrame]',window.parent.document).css('display', 'block');
diff --git a/WebContent/jsp/js/custom.js b/WebContent/jsp/js/custom.js
index 2cde935..5eda123 100644
--- a/WebContent/jsp/js/custom.js
+++ b/WebContent/jsp/js/custom.js
@@ -36,6 +36,14 @@
                 // save the returnValue in options so that it is available in the callback function
                 optns.returnValue = $frame[0].contentWindow.window.returnValue;
                 optns.onClose();
+                // Remove iframe from DOM so window.frames doesn't accumulate stale entries;
+                // without this, a second showModal call leaves frames[0] pointing to the first
+                // (closed) iframe, causing the previous returnValue to bleed into the next callback.
+                var $dialogEl = $frame.closest('.ui-dialog');
+                setTimeout(function() {
+                    $frame.remove();
+                    if ($dialogEl.length) $dialogEl.remove();
+                }, 0);
 
 				if(optns.option && optns.option.fullScreenPopup){
 					$('iframe[name=topFrame]',window.parent.document).css('display', 'block');