parse error freeze (#2106)

CHANGELOG.md

@@ -89,6 +89,8 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 - Fixed file menu displays wrong hotkey in the German translation
 - Fixed [#2090](https://github.com/JabRef/jabref/issues/#2090): If special fields were not selected, two menu item separator were shown
 - Fixed [#2064](https://github.com/JabRef/jabref/issues/2064): Not all `other fields` are shown on entry change of same type
+- Fixed [#2104](https://github.com/JabRef/jabref/issues/#2104): Crash after saving BibTeX source with parsing error
+
 
 ### Removed
 - Removed 2nd preview style

src/main/java/net/sf/jabref/gui/entryeditor/EntryEditor.java

@@ -864,13 +864,15 @@ private boolean storeSource() {
 
             Object[] options = {Localization.lang("Edit"), Localization.lang("Revert to original source")};
 
-            int answer = JOptionPane.showOptionDialog(frame, Localization.lang("Error") + ": " + ex.getMessage(),
-                    Localization.lang("Problem with parsing entry"), JOptionPane.YES_NO_OPTION,
-                    JOptionPane.ERROR_MESSAGE, null, options, options[0]);
-
-            if (answer != 0) {
-                updateSource = true;
-                updateSource();
+            if (!SwingUtilities.isEventDispatchThread()) {
+                int answer = JOptionPane.showOptionDialog(frame, Localization.lang("Error") + ": " + ex.getMessage(),
+                        Localization.lang("Problem with parsing entry"), JOptionPane.YES_NO_OPTION,
+                        JOptionPane.ERROR_MESSAGE, null, options, options[0]);
+
+                if (answer != 0) {
+                    updateSource = true;
+                    updateSource();
+                }
             }
 
             LOGGER.debug("Incorrect source", ex);