--- a/hgext3rd/evolve/obsdiscovery.py	Mon Aug 27 11:33:09 2018 +0200
+++ b/hgext3rd/evolve/obsdiscovery.py	Mon Aug 27 11:40:32 2018 +0200
@@ -437,10 +437,17 @@
         value = self._data.get(rangeid)
         if value is None and self._con is not None:
             nrange = (rangeid[0], rangeid[1])
-            obshash = self._con.execute(_queryobshash, nrange).fetchone()
-            if obshash is not None:
-                value = obshash[0]
-            self._data[rangeid] = value
+            try:
+                obshash = self._con.execute(_queryobshash, nrange).fetchone()
+                if obshash is not None:
+                    value = obshash[0]
+                self._data[rangeid] = value
+            except sqlite3.OperationalError:
+                # something is wrong with the sqlite db
+                # Since this is a cache, we ignore it.
+                if '_con' in vars(self):
+                    del self._con
+                self._new.clear()
         return value
 
     def __setitem__(self, rangeid, obshash):
@@ -478,14 +485,19 @@
                 if con is not None:
                     # always reset for now, the code detecting affect is buggy
                     # so we need to reset more broadly than we would like.
-                    if repo.stablerange._con is None:
-                        con.execute(_reset)
-                        self._data.clear()
-                    else:
-                        ranges = repo.stablerange.contains(repo, affected)
-                        con.executemany(_delete, ranges)
-                        for r in ranges:
-                            self._data.pop(r, None)
+                    try:
+                        if repo.stablerange._con is None:
+                            con.execute(_reset)
+                            self._data.clear()
+                        else:
+                            ranges = repo.stablerange.contains(repo, affected)
+                            con.executemany(_delete, ranges)
+                            for r in ranges:
+                                self._data.pop(r, None)
+                    except sqlite3.OperationalError as exc:
+                        repo.ui.log('evoext-cache', 'error while updating obshashrange cache: %s' % exc)
+                        del self._updating
+                        return
 
                 # rewarm key revisions
                 #

--- a/hgext3rd/evolve/stablerangecache.py	Mon Aug 27 11:33:09 2018 +0200
+++ b/hgext3rd/evolve/stablerangecache.py	Mon Aug 27 11:40:32 2018 +0200
@@ -177,11 +177,19 @@
         cache = self._subrangescache
         if rangeid not in cache and rangeid[0] <= self._ondisktiprev and self._con is not None:
             value = None
-            result = self._con.execute(_queryrange, rangeid).fetchone()
-            if result is not None: # database know about this node (skip in the future?)
-                value = self._con.execute(_querysubranges, rangeid).fetchall()
-            # in memory caching of the value
-            cache[rangeid] = value
+            try:
+                result = self._con.execute(_queryrange, rangeid).fetchone()
+                if result is not None: # database know about this node (skip in the future?)
+                    value = self._con.execute(_querysubranges, rangeid).fetchall()
+                # in memory caching of the value
+                cache[rangeid] = value
+            except sqlite3.OperationalError:
+                # something is wrong with the sqlite db
+                # Since this is a cache, we ignore it.
+                if '_con' in vars(self):
+                    del self._con
+                self._unsavedsubranges.clear()
+
         return cache.get(rangeid)
 
     def _setsub(self, rangeid, value):