3 files changed, 23 insertions, 10 deletions
diff --git a/searx/plugins/https_rewrite.py b/searx/plugins/https_rewrite.py
index 3d986770e..82556017e 100644
--- a/searx/plugins/https_rewrite.py
+++ b/searx/plugins/https_rewrite.py
@@ -225,6 +225,9 @@ def https_url_rewrite(result):
 
 
 def on_result(request, search, result):
+    if 'parsed_url' not in result:
+        return True
+
     if result['parsed_url'].scheme == 'http':
         https_url_rewrite(result)
     return True
diff --git a/searx/plugins/oa_doi_rewrite.py b/searx/plugins/oa_doi_rewrite.py
index d4942498f..be80beb26 100644
--- a/searx/plugins/oa_doi_rewrite.py
+++ b/searx/plugins/oa_doi_rewrite.py
@@ -35,6 +35,9 @@ def get_doi_resolver(args, preference_doi_resolver):
 
 
 def on_result(request, search, result):
+    if 'parsed_url' not in result:
+        return True
+
     doi = extract_doi(result['parsed_url'])
     if doi and len(doi) < 50:
         for suffix in ('/', '.pdf', '/full', '/meta', '/abstract'):
diff --git a/searx/plugins/tracker_url_remover.py b/searx/plugins/tracker_url_remover.py
index 630c8a638..33dd621e1 100644
--- a/searx/plugins/tracker_url_remover.py
+++ b/searx/plugins/tracker_url_remover.py
@@ -17,10 +17,10 @@ along with searx. If not, see < http://www.gnu.org/licenses/ >.
 
 from flask_babel import gettext
 import re
-from searx.url_utils import urlunparse
+from searx.url_utils import urlunparse, parse_qsl, urlencode
 
-regexes = {re.compile(r'utm_[^&]+&?'),
-           re.compile(r'(wkey|wemail)[^&]+&?'),
+regexes = {re.compile(r'utm_[^&]+'),
+           re.compile(r'(wkey|wemail)[^&]*'),
            re.compile(r'&$')}
 
 name = gettext('Tracker URL remover')
@@ -30,16 +30,23 @@ preference_section = 'privacy'
 
 
 def on_result(request, search, result):
+    if 'parsed_url' not in result:
+        return True
+
     query = result['parsed_url'].query
 
     if query == "":
         return True
-
-    for reg in regexes:
-        query = reg.sub('', query)
-
-    if query != result['parsed_url'].query:
-        result['parsed_url'] = result['parsed_url']._replace(query=query)
-        result['url'] = urlunparse(result['parsed_url'])
+    parsed_query = parse_qsl(query)
+
+    changes = 0
+    for i, (param_name, _) in enumerate(list(parsed_query)):
+        for reg in regexes:
+            if reg.match(param_name):
+                parsed_query.pop(i - changes)
+                changes += 1
+                result['parsed_url'] = result['parsed_url']._replace(query=urlencode(parsed_query))
+                result['url'] = urlunparse(result['parsed_url'])
+                break
 
     return True