Fix patternProperties & additionalProperties lead to ASSERT

Fix #825

include/rapidjson/schema.h

@@ -783,8 +783,10 @@ public:
         if (patternProperties_) {
             context.patternPropertiesSchemaCount = 0;
             for (SizeType i = 0; i < patternPropertyCount_; i++)
-                if (patternProperties_[i].pattern && IsPatternMatch(patternProperties_[i].pattern, str, len))
+                if (patternProperties_[i].pattern && IsPatternMatch(patternProperties_[i].pattern, str, len)) {
                     context.patternPropertiesSchemas[context.patternPropertiesSchemaCount++] = patternProperties_[i].schema;
+                    context.valueSchema = typeless_;
+                }
         }
 
         SizeType index;

test/unittest/schematest.cpp

@@ -1322,6 +1322,13 @@ TEST(SchemaValidator, Issue728_AllOfRef) {
     VALIDATE(s, "{\"key1\": \"abc\", \"key2\": \"def\"}", true);
 }
 
+TEST(SchemaValidator, Issue825) {
+    Document sd;
+    sd.Parse("{\"type\": \"object\", \"additionalProperties\": false, \"patternProperties\": {\"^i\": { \"type\": \"string\" } } }");
+    SchemaDocument s(sd);
+    VALIDATE(s, "{ \"item\": \"hello\" }", true);
+}
+
 #ifdef __clang__
 RAPIDJSON_DIAG_POP
 #endif