diff --git a/context.go b/context.go
index 1dc730e3..aaba738d 100644
--- a/context.go
+++ b/context.go
@@ -648,13 +648,18 @@ func (c *Context) PostFormArray(key string) (values []string) {
 func (c *Context) initFormCache() {
 	if c.formCache == nil {
 		c.formCache = make(url.Values)
-		req := c.Request
-		if err := req.ParseMultipartForm(c.engine.MaxMultipartMemory); err != nil {
-			if !errors.Is(err, http.ErrNotMultipart) {
-				debugPrint("error on parse multipart form array: %v", err)
+		if c.Request != nil {
+			var maxMemory int64 = defaultMultipartMemory
+			if c.engine != nil {
+				maxMemory = c.engine.MaxMultipartMemory
 			}
+			if err := c.Request.ParseMultipartForm(maxMemory); err != nil {
+				if !errors.Is(err, http.ErrNotMultipart) {
+					debugPrint("error on parse multipart form array: %v", err)
+				}
+			}
+			c.formCache = c.Request.PostForm
 		}
-		c.formCache = req.PostForm
 	}
 }
 
diff --git a/context_test.go b/context_test.go
index e8d305e4..654cfeaf 100644
--- a/context_test.go
+++ b/context_test.go
@@ -3955,3 +3955,43 @@ func BenchmarkGetMapFromFormData(b *testing.B) {
 		})
 	}
 }
+
+func TestContextPostFormWithoutRequest(t *testing.T) {
+	// Case 1: c.Request is nil, c.engine is nil
+	c1 := &Context{}
+	val, ok := c1.GetPostForm("key")
+	assert.False(t, ok)
+	assert.Empty(t, val)
+	assert.Empty(t, c1.PostForm("key"))
+	assert.Equal(t, "default_val", c1.DefaultPostForm("key", "default_val"))
+	assert.Empty(t, c1.PostFormArray("key"))
+	assert.Empty(t, c1.PostFormMap("key"))
+
+	// Case 2: c.Request is nil, c.engine is not nil
+	c2, _ := CreateTestContext(httptest.NewRecorder())
+	c2.Request = nil
+	val, ok = c2.GetPostForm("key")
+	assert.False(t, ok)
+	assert.Empty(t, val)
+	assert.Empty(t, c2.PostForm("key"))
+	assert.Equal(t, "default_val", c2.DefaultPostForm("key", "default_val"))
+	assert.Empty(t, c2.PostFormArray("key"))
+	assert.Empty(t, c2.PostFormMap("key"))
+
+	// Case 3: c.Request is not nil, c.engine is nil
+	c3 := &Context{}
+	req3, _ := http.NewRequest(http.MethodPost, "/", strings.NewReader("key=value3"))
+	req3.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	c3.Request = req3
+	val, ok = c3.GetPostForm("key")
+	assert.True(t, ok)
+	assert.Equal(t, "value3", val)
+
+	// Case 4: c.Request has multipart error, c.engine is nil
+	c4 := &Context{}
+	req4, _ := http.NewRequest(http.MethodPost, "/", strings.NewReader("bad multipart payload"))
+	req4.Header.Set("Content-Type", "multipart/form-data; boundary=boundary")
+	c4.Request = req4
+	_, ok = c4.GetPostForm("key")
+	assert.False(t, ok)
+}