diff --git a/searx/engines/presearch.py b/searx/engines/presearch.py
index 034233163..1093b5cff 100644
--- a/searx/engines/presearch.py
+++ b/searx/engines/presearch.py
@@ -184,6 +184,8 @@ def _fix_title(title, url):
 
 def parse_search_query(json_results):
     results = []
+    if not json_results:
+        return results
 
     for item in json_results.get('specialSections', {}).get('topStoriesCompact', {}).get('data', []):
         result = {
@@ -245,7 +247,7 @@ def response(resp):
     json_resp = resp.json()
 
     if search_type == 'search':
-        results = parse_search_query(json_resp.get('results'))
+        results = parse_search_query(json_resp.get('results', {}))
 
     elif search_type == 'images':
         for item in json_resp.get('images', []):
diff --git a/searx/result_types/_base.py b/searx/result_types/_base.py
index caf7e2a4f..ce846c3cf 100644
--- a/searx/result_types/_base.py
+++ b/searx/result_types/_base.py
@@ -103,8 +103,10 @@ def _normalize_text_fields(result: MainResult | LegacyResult):
         result.content = str(result)
 
     # normalize title and content
-    result.title = WHITESPACE_REGEX.sub(" ", result.title).strip()
-    result.content = WHITESPACE_REGEX.sub(" ", result.content).strip()
+    if result.title:
+        result.title = WHITESPACE_REGEX.sub(" ", result.title).strip()
+    if result.content:
+        result.content = WHITESPACE_REGEX.sub(" ", result.content).strip()
     if result.content == result.title:
         # avoid duplicate content between the content and title fields
         result.content = ""
diff --git a/searx/utils.py b/searx/utils.py
index ee044704b..a28171a32 100644
--- a/searx/utils.py
+++ b/searx/utils.py
@@ -154,6 +154,8 @@ def html_to_text(html_str: str) -> str:
         >>> html_to_text(r'regexp: (?<![a-zA-Z]')
         'regexp: (?<![a-zA-Z]'
     """
+    if not html_str:
+        return ""
     html_str = html_str.replace('\n', ' ').replace('\r', ' ')
     html_str = ' '.join(html_str.split())
     s = _HTMLTextExtractor()
diff --git a/searx/webapp.py b/searx/webapp.py
index b721c7132..23c5d70cc 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -265,6 +265,9 @@ def custom_url_for(endpoint: str, **values):
 
 
 def morty_proxify(url: str):
+    if not url:
+        return url
+
     if url.startswith('//'):
         url = 'https:' + url
 
@@ -280,6 +283,8 @@ def morty_proxify(url: str):
 
 
 def image_proxify(url: str):
+    if not url:
+        return url
 
     if url.startswith('//'):
         url = 'https:' + url