fix create problem

resources/views/admin/invoice/invoiceForm.blade.php

@@ -29,9 +29,9 @@
                         </label>
                         <select name="customer_id" data-live-search="true" id="customer_id"
                                 class="form-control searchable  @error('customer_id') is-invalid @enderror">
-                            @foreach(\App\models\Customer::all() as $customer )
+                            @foreach(\App\Models\Customer::all() as $customer )
                                 <option value="{{ $customer->id }}"
-                                        @if (old('customer_id',$invoice->customer_id??null) == $customer->id ) selected @endif > {{$customer->name}} </option>
+                                        @if (old('customer_id',$invoice?->customer_id??null) == $customer->id ) selected @endif > {{$customer->name}} </option>
                             @endforeach
                         </select>
                     </div>
@@ -76,6 +76,7 @@
                                value="{{old('tracking_code',$invoice->tracking_code??null)}}"/>
                     </div>
                 </div>
+                @if(isset($invoice))
                     @foreach($invoice->products as $product )
 
                         <div class="col-md-6">
@@ -86,7 +87,8 @@
                                             <label for="products">
                                                 {{__('Product')}}
                                             </label>
-                                       <select data-live-search="true" name="products.ids[]" data-live-search="true" id="products"
+                                            <select data-live-search="true" name="products.ids[]"
+                                                    data-live-search="true" id="products"
                                                     class="form-control searchable">
                                                 @foreach(\App\models\Product::all() as $allProduct )
                                                     <option value="{{ $allProduct->id }}"
@@ -100,10 +102,12 @@
                                             <label for="count">
                                                 {{__('Count')}}
                                             </label>
-                                       <input type="number" name="products.counts[]" value="{{$product->pivot->count}}"
+                                            <input type="number" name="products.counts[]"
+                                                   value="{{$product->pivot->count}}"
                                                    id="" class="form-control">
                                             <button class="btn btn-outline-danger "
-                                               onclick="document.getElementById('product_{{$product->id}}').remove()"> X
+                                                    onclick="document.getElementById('product_{{$product->id}}').remove()">
+                                                X
                                             </button>
                                         </div>
                                     </div>
@@ -113,6 +117,8 @@
                         </div>
 
                     @endforeach
+                @endif
+
                 <div class="col-md-12">
                     <label> &nbsp;</label>
                     <input name="" type="submit" class="btn btn-primary mt-2" value="{{__('Save')}}"/>