diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
index 3118b55..ff3a240 100644
--- a/Modules/_elementtree.c
+++ b/Modules/_elementtree.c
@@ -352,7 +352,10 @@
             return NULL;
         }
         attrib = PyDict_Copy(attrib);
-        PyDict_DelItem(kwds, attrib_str);
+        if (attrib && PyDict_DelItem(kwds, attrib_str) < 0) {
+            Py_DECREF(attrib);
+            attrib = NULL;
+        }
     } else {
         attrib = PyDict_New();
     }
diff --git a/Modules/_threadmodule.c b/Modules/_threadmodule.c
index 16d3191..2a6b893 100644
--- a/Modules/_threadmodule.c
+++ b/Modules/_threadmodule.c
@@ -777,9 +777,11 @@
         for(tstate = PyInterpreterState_ThreadHead(tstate->interp);
             tstate;
             tstate = PyThreadState_Next(tstate))
-            if (tstate->dict &&
-                PyDict_GetItem(tstate->dict, self->key))
-                PyDict_DelItem(tstate->dict, self->key);
+            if (tstate->dict && PyDict_GetItem(tstate->dict, self->key)) {
+                if (PyDict_DelItem(tstate->dict, self->key)) {
+                    PyErr_Clear();
+                }
+            }
     }
     return 0;
 }
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 53bf996..e6d3f8b 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -360,10 +360,14 @@
         else {
             if (PyDict_GetItemString(
                     dict,
-                    win_runtime_flags[i].flag_name) != NULL) {
-                PyDict_DelItemString(
-                    dict,
-                    win_runtime_flags[i].flag_name);
+                    win_runtime_flags[i].flag_name) != NULL)
+            {
+                if (PyDict_DelItemString(
+                        dict,
+                        win_runtime_flags[i].flag_name))
+                {
+                    PyErr_Clear();
+                }
             }
         }
     }
diff --git a/Objects/namespaceobject.c b/Objects/namespaceobject.c
index 7de102e..c2f9d30 100644
--- a/Objects/namespaceobject.c
+++ b/Objects/namespaceobject.c
@@ -103,15 +103,15 @@
             PyObject *value, *item;
 
             value = PyDict_GetItem(d, key);
-            assert(value != NULL);
-
-            item = PyUnicode_FromFormat("%S=%R", key, value);
-            if (item == NULL) {
-                loop_error = 1;
-            }
-            else {
-                loop_error = PyList_Append(pairs, item);
-                Py_DECREF(item);
+            if (value != NULL) {
+                item = PyUnicode_FromFormat("%S=%R", key, value);
+                if (item == NULL) {
+                    loop_error = 1;
+                }
+                else {
+                    loop_error = PyList_Append(pairs, item);
+                    Py_DECREF(item);
+                }
             }
         }
 
diff --git a/Python/_warnings.c b/Python/_warnings.c
index 29e475d..80dca65 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -256,7 +256,11 @@
     version_obj = _PyDict_GetItemId(registry, &PyId_version);
     if (version_obj == NULL
         || !PyLong_CheckExact(version_obj)
-        || PyLong_AsLong(version_obj) != _PyRuntime.warnings.filters_version) {
+        || PyLong_AsLong(version_obj) != _PyRuntime.warnings.filters_version)
+    {
+        if (PyErr_Occurred()) {
+            return -1;
+        }
         PyDict_Clear(registry);
         version_obj = PyLong_FromLong(_PyRuntime.warnings.filters_version);
         if (version_obj == NULL)
diff --git a/Python/ceval.c b/Python/ceval.c
index e371d34..00b2e6d 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -5027,7 +5027,7 @@
             PyObject *names = f->f_code->co_names;
             PyObject *name = GETITEM(names, oparg);
             PyObject *locals = f->f_locals;
-            if (PyDict_CheckExact(locals) &&
+            if (locals && PyDict_CheckExact(locals) &&
                 PyDict_GetItem(locals, name) == v) {
                 if (PyDict_DelItem(locals, name) != 0) {
                     PyErr_Clear();
diff --git a/Python/codecs.c b/Python/codecs.c
index eb3cd35..c315ae3 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -130,8 +130,10 @@
 
     /* Next, scan the search functions in order of registration */
     args = PyTuple_New(1);
-    if (args == NULL)
-        goto onError;
+    if (args == NULL) {
+        Py_DECREF(v);
+        return NULL;
+    }
     PyTuple_SET_ITEM(args,0,v);
 
     len = PyList_Size(interp->codec_search_path);
diff --git a/Python/import.c b/Python/import.c
index 709fc43..5f5d135 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -2138,10 +2138,10 @@
     }
 
     mod = _PyImport_FindExtensionObject(name, path);
-    if (mod != NULL) {
+    if (mod != NULL || PyErr_Occurred()) {
         Py_DECREF(name);
         Py_DECREF(path);
-        Py_INCREF(mod);
+        Py_XINCREF(mod);
         return mod;
     }
 
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 4b08c9c..94b6d43 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -1417,6 +1417,9 @@
         PyDict_SetItemString(interp->sysdict, "modules", modules);
         _PySys_EndInit(interp->sysdict, &interp->config);
     }
+    else if (PyErr_Occurred()) {
+        goto handle_error;
+    }
 
     bimod = _PyImport_FindBuiltin("builtins", modules);
     if (bimod != NULL) {
@@ -1425,6 +1428,9 @@
             goto handle_error;
         Py_INCREF(interp->builtins);
     }
+    else if (PyErr_Occurred()) {
+        goto handle_error;
+    }
 
     /* initialize builtin exceptions */
     _PyExc_Init(bimod);