diff --git a/src/octoprint/server/__init__.py b/src/octoprint/server/__init__.py
index 7fd0eb70..0b2e1206 100644
--- a/src/octoprint/server/__init__.py
+++ b/src/octoprint/server/__init__.py
@@ -793,6 +793,12 @@ class Server(object):
 					additional_request_data = kwargs.get("_additional_request_data", dict())
 					kwargs = dict((k, v) for k, v in kwargs.items() if not k.startswith("_") and not k == "plugin")
 					kwargs.update(additional_request_data)
+
+					base_url = kwargs.get("base_url", "")
+					if not (base_url.startswith("http://") or base_url.startswith("https://")):
+						self._logger.info("Skipping preemptive cache entry with base url {}, neither http:// nor https:// and possibly broken".format(base_url))
+						continue
+
 					try:
 						if plugin:
 							self._logger.info("Preemptively caching {} (plugin {}) for {!r}".format(route, plugin, kwargs))
diff --git a/src/octoprint/server/util/flask.py b/src/octoprint/server/util/flask.py
index 68f25703..4f6b3dbe 100644
--- a/src/octoprint/server/util/flask.py
+++ b/src/octoprint/server/util/flask.py
@@ -488,6 +488,12 @@ class PreemptiveCache(object):
 			return matched, unmatched
 
 		with self._lock:
+			if not self._log_access:
+				self._logger.debug(
+					"Not updating timestamp and counter for {} and {!r}, currently flagged as disabled".format(root,
+					                                                                                           data))
+				return
+
 			cache_data = self.get_all_data()
 
 			if not root in cache_data:
@@ -509,12 +515,10 @@ class PreemptiveCache(object):
 				to_persist["_timestamp"] = time.time()
 				to_persist["_count"] = 1
 				self._logger.info("Adding entry for {} and {!r}".format(root, to_persist))
-			elif self._log_access:
+			else:
 				to_persist["_timestamp"] = time.time()
 				to_persist["_count"] = to_persist.get("_count", 0) + 1
 				self._logger.debug("Updating timestamp and counter for {} and {!r}".format(root, data))
-			else:
-				self._logger.debug("Not updating timestamp and counter for {} and {!r}, currently flagged as disabled".format(root, data))
 
 			self.set_data(root, [to_persist] + other)
 
diff --git a/src/octoprint/server/views.py b/src/octoprint/server/views.py
index 3b74bb74..6140eb4c 100644
--- a/src/octoprint/server/views.py
+++ b/src/octoprint/server/views.py
@@ -32,7 +32,7 @@ _valid_div_re = re.compile("[a-zA-Z_-]+")
 @app.route("/")
 @util.flask.preemptively_cached(cache=preemptiveCache,
                                 data=lambda: dict(path=request.path, base_url=request.url_root, query_string="l10n={}".format(g.locale.language) if g.locale else "en"),
-                                unless=lambda: request.url_root in settings().get(["server", "preemptiveCache", "exceptions"]))
+                                unless=lambda: request.url_root in settings().get(["server", "preemptiveCache", "exceptions"]) or not (request.url_root.startswith("http://") or request.url_root.startswith("https://")))
 @util.flask.conditional(lambda: _check_etag_and_lastmodified_for_index(), NOT_MODIFIED)
 @util.flask.cached(timeout=-1,
                    refreshif=lambda cached: _validate_cache_for_index(cached),