diff --git a/openlp/plugins/songs/forms/editverseform.py b/openlp/plugins/songs/forms/editverseform.py
index e101f2d90..55a2dfcc6 100644
--- a/openlp/plugins/songs/forms/editverseform.py
+++ b/openlp/plugins/songs/forms/editverseform.py
@@ -26,6 +26,8 @@ import logging
 from PyQt5 import QtCore, QtGui, QtWidgets
 
 from openlp.plugins.songs.lib import VerseType, transpose_lyrics
+from openlp.core.lib.ui import critical_error_message_box
+from openlp.core.common import translate
 from .editversedialog import Ui_EditVerseDialog
 
 log = logging.getLogger(__name__)
@@ -101,8 +103,16 @@ class EditVerseForm(QtWidgets.QDialog, Ui_EditVerseDialog):
         """
         The transpose up button clicked
         """
-        transposed_lyrics = transpose_lyrics(self.verse_text_edit.toPlainText(), 1)
-        self.verse_text_edit.setPlainText(transposed_lyrics)
+        try:
+            transposed_lyrics = transpose_lyrics(self.verse_text_edit.toPlainText(), 1)
+            self.verse_text_edit.setPlainText(transposed_lyrics)
+        except ValueError as ve:
+            # Transposing failed
+            critical_error_message_box(title=translate('SongsPlugin.EditVerseForm', 'Transposing failed'),
+                                       message=translate('SongsPlugin.EditVerseForm',
+                                                         'Transposing failed because of invalid chord:\n{err_msg}'
+                                                         .format(err_msg=ve)))
+            return
         self.verse_text_edit.setFocus()
         self.verse_text_edit.moveCursor(QtGui.QTextCursor.End)
 
@@ -110,7 +120,16 @@ class EditVerseForm(QtWidgets.QDialog, Ui_EditVerseDialog):
         """
         The transpose down button clicked
         """
-        transposed_lyrics = transpose_lyrics(self.verse_text_edit.toPlainText(), -1)
+        try:
+            transposed_lyrics = transpose_lyrics(self.verse_text_edit.toPlainText(), -1)
+            self.verse_text_edit.setPlainText(transposed_lyrics)
+        except ValueError as ve:
+            # Transposing failed
+            critical_error_message_box(title=translate('SongsPlugin.EditVerseForm', 'Transposing failed'),
+                                       message=translate('SongsPlugin.EditVerseForm',
+                                                         'Transposing failed because of invalid chord:\n{err_msg}'
+                                                         .format(err_msg=ve)))
+            return
         self.verse_text_edit.setPlainText(transposed_lyrics)
         self.verse_text_edit.setFocus()
         self.verse_text_edit.moveCursor(QtGui.QTextCursor.End)
diff --git a/openlp/plugins/songs/lib/__init__.py b/openlp/plugins/songs/lib/__init__.py
index f87cbc35d..c0a9d917b 100644
--- a/openlp/plugins/songs/lib/__init__.py
+++ b/openlp/plugins/songs/lib/__init__.py
@@ -380,7 +380,7 @@ def clean_song(manager, song):
     if isinstance(song.lyrics, bytes):
         song.lyrics = str(song.lyrics, encoding='utf8')
     verses = SongXML().get_verses(song.lyrics)
-    song.search_lyrics = ' '.join([clean_string(clean_tags(verse[1])) for verse in verses])
+    song.search_lyrics = ' '.join([clean_string(clean_tags(verse[1], True)) for verse in verses])
     # The song does not have any author, add one.
     if not song.authors_songs:
         name = SongStrings.AuthorUnknown
diff --git a/scripts/appveyor.yml b/scripts/appveyor.yml
index 060db19f5..8b123e5a7 100644
--- a/scripts/appveyor.yml
+++ b/scripts/appveyor.yml
@@ -14,7 +14,7 @@ install:
   # Install dependencies from pypi
   - "%PYTHON%\\python.exe -m pip install sqlalchemy alembic chardet beautifulsoup4 Mako nose mock pyodbc==4.0.8 psycopg2 pypiwin32 pyenchant"
   # Install mysql dependency
-  - "%PYTHON%\\python.exe -m pip install http://cdn.mysql.com/Downloads/Connector-Python/mysql-connector-python-2.1.5.zip#md5=ce4a24cb1746c1c8f6189a97087f21c1"
+  - "%PYTHON%\\python.exe -m pip install http://cdn.mysql.com/Downloads/Connector-Python/mysql-connector-python-2.0.4.zip#md5=3df394d89300db95163f17c843ef49df"
   # Download and install lxml and pyicu (originally from http://www.lfd.uci.edu/~gohlke/pythonlibs/)
   - "%PYTHON%\\python.exe -m pip install https://get.openlp.org/win-sdk/lxml-3.6.4-cp34-cp34m-win32.whl"
   - "%PYTHON%\\python.exe -m pip install https://get.openlp.org/win-sdk/PyICU-1.9.5-cp34-cp34m-win32.whl"