diff --git a/src/wm.ts b/src/wm.ts
index 4119596..a3f9168 100644
--- a/src/wm.ts
+++ b/src/wm.ts
@@ -88,14 +88,14 @@ export class FlowWindow {
       this.focus()
     }
 
-    if (config.canResize === undefined) config.canResize = true
+    if (config.canResize === undefined || config.canResize === null) config.canResize = true
 
     this.element.style.width = `${config.width ?? 300}px`
     this.element.style.height = `${config.height ?? 200}px`
 
     this.header = document.createElement('window-header')
     this.header.innerHTML = `<img src="${config.icon}"></img> <div class="title">${config.title}</div><div style="flex:1;"></div><i id="min" class='bx bx-minus'></i><i id="close" class='bx bx-x'></i>`
-    if (!config.canResize) {
+    if (config.canResize) {
       this.header.innerHTML = `<img src="${config.icon}"></img> <div class="title">${config.title}</div><div style="flex:1;"></div><i id="min" class='bx bx-minus'></i><i id="max" class='bx bx-checkbox'></i><i id="close" class='bx bx-x'></i>`
     }
 
@@ -105,7 +105,7 @@ export class FlowWindow {
 
     (this.header.querySelector('#min') as HTMLElement).onclick = () => this.toggleMin()
 
-    if (!config.canResize) {
+    if (config.canResize) {
       (this.header.querySelector('#max') as HTMLElement).onclick = () => this.toggleMax()
     }