diff --git a/Modules/_json.c b/Modules/_json.c
index f87d680..2f42c34 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -595,6 +595,9 @@
     int has_pairs_hook = (s->object_pairs_hook != Py_None);
     Py_ssize_t next_idx;
 
+    if (strict < 0)
+        return NULL;
+
     if (PyUnicode_READY(pystr) == -1)
         return NULL;
 
@@ -940,6 +943,7 @@
     void *str;
     int kind;
     Py_ssize_t length;
+    int strict;
 
     if (PyUnicode_READY(pystr) == -1)
         return NULL;
@@ -960,9 +964,10 @@
     switch (PyUnicode_READ(kind, str, idx)) {
         case '"':
             /* string */
-            return scanstring_unicode(pystr, idx + 1,
-                PyObject_IsTrue(s->strict),
-                next_idx_ptr);
+            strict = PyObject_IsTrue(s->strict);
+            if (strict < 0)
+                return NULL;
+            return scanstring_unicode(pystr, idx + 1, strict, next_idx_ptr);
         case '{':
             /* object */
             if (Py_EnterRecursiveCall(" while decoding a JSON object "
@@ -1212,12 +1217,13 @@
 
     PyEncoderObject *s;
     PyObject *markers, *defaultfn, *encoder, *indent, *key_separator;
-    PyObject *item_separator, *sort_keys, *skipkeys, *allow_nan;
+    PyObject *item_separator, *sort_keys, *skipkeys;
+    int allow_nan;
 
     assert(PyEncoder_Check(self));
     s = (PyEncoderObject *)self;
 
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOOOOOOOO:make_encoder", kwlist,
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOOOOOOOp:make_encoder", kwlist,
         &markers, &defaultfn, &encoder, &indent, &key_separator, &item_separator,
         &sort_keys, &skipkeys, &allow_nan))
         return -1;
@@ -1231,7 +1237,7 @@
     s->sort_keys = sort_keys;
     s->skipkeys = skipkeys;
     s->fast_encode = (PyCFunction_Check(s->encoder) && PyCFunction_GetFunction(s->encoder) == (PyCFunction)py_encode_basestring_ascii);
-    s->allow_nan = PyObject_IsTrue(allow_nan);
+    s->allow_nan = allow_nan;
 
     Py_INCREF(s->markers);
     Py_INCREF(s->defaultfn);
@@ -1500,6 +1506,7 @@
     PyObject *items;
     PyObject *item = NULL;
     int skipkeys;
+    int sortkeys;
     Py_ssize_t idx;
 
     if (open_dict == NULL || close_dict == NULL || empty_dict == NULL) {
@@ -1544,13 +1551,16 @@
     items = PyMapping_Items(dct);
     if (items == NULL)
         goto bail;
-    if (PyObject_IsTrue(s->sort_keys) && PyList_Sort(items) < 0)
+    sortkeys = PyObject_IsTrue(s->sort_keys);
+    if (sortkeys < 0 || (sortkeys && PyList_Sort(items) < 0))
         goto bail;
     it = PyObject_GetIter(items);
     Py_DECREF(items);
     if (it == NULL)
         goto bail;
     skipkeys = PyObject_IsTrue(s->skipkeys);
+    if (skipkeys < 0)
+        goto bail;
     idx = 0;
     while ((item = PyIter_Next(it)) != NULL) {
         PyObject *encoded, *key, *value;
diff --git a/Modules/_threadmodule.c b/Modules/_threadmodule.c
index 9925b0e..f80f76a 100644
--- a/Modules/_threadmodule.c
+++ b/Modules/_threadmodule.c
@@ -718,12 +718,18 @@
         "_localdummy_destroyed", (PyCFunction) _localdummy_destroyed, METH_O
     };
 
-    if (type->tp_init == PyBaseObject_Type.tp_init
-        && ((args && PyObject_IsTrue(args))
-        || (kw && PyObject_IsTrue(kw)))) {
-        PyErr_SetString(PyExc_TypeError,
-                  "Initialization arguments are not supported");
-        return NULL;
+    if (type->tp_init == PyBaseObject_Type.tp_init) {
+        int rc = 0;
+        if (args != NULL)
+            rc = PyObject_IsTrue(args);
+        if (rc == 0 && kw != NULL)
+            rc = PyObject_IsTrue(kw);
+        if (rc != 0) {
+            if (rc > 0)
+                PyErr_SetString(PyExc_TypeError,
+                          "Initialization arguments are not supported");
+            return NULL;
+        }
     }
 
     self = (localobject *)type->tp_alloc(type, 0);
diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
index c729414..1493f8d 100644
--- a/Modules/faulthandler.c
+++ b/Modules/faulthandler.c
@@ -1087,8 +1087,8 @@
 
         has_key = PyDict_Contains(xoptions, key);
         Py_DECREF(key);
-        if (!has_key)
-            return 0;
+        if (has_key <= 0)
+            return has_key;
     }
 
     module = PyImport_ImportModule("faulthandler");