Fix TypeError on null path variable (#2967)

* Fix the error

* add tests

2 files changed, 27 insertions, 1 deletions

diff --git a/src/htmx.js b/src/htmx.js
index f949da04..911b7dde 100644
--- a/src/htmx.js
+++ b/src/htmx.js
@@ -2323,7 +2323,7 @@ var htmx = (function() {
         const rawAttribute = getRawAttribute(elt, 'method')
         verb = (/** @type HttpVerb */(rawAttribute ? rawAttribute.toLowerCase() : 'get'))
         path = getRawAttribute(elt, 'action')
-        if (verb === 'get' && path.includes('?')) {
+        if (verb === 'get' && path && path.includes('?')) {
           path = path.replace(/\?[^#]+/, '')
         }
       }
diff --git a/test/attributes/hx-boost.js b/test/attributes/hx-boost.js
index 20b49f63..2b1928f3 100644
--- a/test/attributes/hx-boost.js
+++ b/test/attributes/hx-boost.js
@@ -143,4 +143,30 @@ describe('hx-boost attribute', function() {
     this.server.respond()
     div.innerHTML.should.equal('Boosted!')
   })
+
+  it('form get with an unset action property', function() {
+    this.server.respondWith('GET', /\/*/, function(xhr) {
+      should.equal(undefined, getParameters(xhr).foo)
+      xhr.respond(200, {}, 'Boosted!')
+    })
+
+    var div = make('<div hx-target="this" hx-boost="true"><form id="f1" method="get"><button id="b1">Submit</button></form></div>')
+    var btn = byId('b1')
+    btn.click()
+    this.server.respond()
+    div.innerHTML.should.equal('Boosted!')
+  })
+
+  it('form get with an empty action property', function() {
+    this.server.respondWith('GET', /\/*/, function(xhr) {
+      should.equal(undefined, getParameters(xhr).foo)
+      xhr.respond(200, {}, 'Boosted!')
+    })
+
+    var div = make('<div hx-target="this" hx-boost="true"><form id="f1" action="" method="get"><button id="b1">Submit</button></form></div>')
+    var btn = byId('b1')
+    btn.click()
+    this.server.respond()
+    div.innerHTML.should.equal('Boosted!')
+  })
 })