Fix CivitAI model browser failing when an image has null width or height

StabilityMatrix.Core/Models/Api/CivitImage.cs

@@ -11,10 +11,10 @@ public class CivitImage
     public int? NsfwLevel { get; set; }
 
     [JsonPropertyName("width")]
-    public int Width { get; set; }
+    public int? Width { get; set; }
 
     [JsonPropertyName("height")]
-    public int Height { get; set; }
+    public int? Height { get; set; }
 
     [JsonPropertyName("hash")]
     public string Hash { get; set; }

StabilityMatrix.Core/Models/PackageModification/DownloadCivitWorkflowStep.cs

@@ -285,8 +285,8 @@ private WorkflowMetadata CreateMetadata(string name, bool isMultiple)
                         new OpenArtThumbnail
                         {
                             Url = new Uri(thumbnailUrl),
-                            Width = thumbnail!.Width,
-                            Height = thumbnail.Height,
+                            Width = thumbnail!.Width ?? 0,
+                            Height = thumbnail.Height ?? 0,
                         },
                     ],
             },

StabilityMatrix.Tests/Core/CivitImageTests.cs

@@ -0,0 +1,78 @@
+using System.Text.Json;
+using StabilityMatrix.Core.Models.Api;
+
+namespace StabilityMatrix.Tests.Core;
+
+[TestClass]
+public class CivitImageTests
+{
+    [TestMethod]
+    public void TestDeserialize_CivitImageWithNullDimensions_ShouldBeNull()
+    {
+        // CivitAI sends null width/height for some images (observed live 2026-11-06, issue #1792)
+        const string json = """
+            {
+                "url": "https://image.civitai.com/example.jpeg",
+                "nsfwLevel": 8,
+                "width": null,
+                "height": null,
+                "hash": "abc",
+                "type": "image"
+            }
+            """;
+
+        var result = JsonSerializer.Deserialize<CivitImage>(json);
+
+        Assert.IsNotNull(result);
+        Assert.IsNull(result.Width);
+        Assert.IsNull(result.Height);
+        Assert.AreEqual("https://image.civitai.com/example.jpeg", result.Url);
+    }
+
+    [TestMethod]
+    public void TestDeserialize_CivitImageWithDimensions_ShouldReadValues()
+    {
+        const string json = """
+            { "url": "https://image.civitai.com/example.jpeg", "width": 832, "height": 1216 }
+            """;
+
+        var result = JsonSerializer.Deserialize<CivitImage>(json);
+
+        Assert.IsNotNull(result);
+        Assert.AreEqual(832, result.Width);
+        Assert.AreEqual(1216, result.Height);
+    }
+
+    [TestMethod]
+    public void TestDeserialize_ModelsResponseWithNullImageDimensions_ShouldKeepAllItems()
+    {
+        // One image with null dimensions used to fail the whole page of results
+        const string json = """
+            {
+                "items": [
+                    {
+                        "id": 1,
+                        "name": "First",
+                        "modelVersions": [
+                            { "id": 10, "name": "v1", "images": [ { "url": "https://a", "width": 512, "height": 512 } ] }
+                        ]
+                    },
+                    {
+                        "id": 2,
+                        "name": "Second",
+                        "modelVersions": [
+                            { "id": 20, "name": "v1", "images": [ { "url": "https://b", "width": null, "height": null } ] }
+                        ]
+                    }
+                ],
+                "metadata": {}
+            }
+            """;
+
+        var result = JsonSerializer.Deserialize<CivitModelsResponse>(json);
+
+        Assert.IsNotNull(result?.Items);
+        Assert.AreEqual(2, result.Items.Count);
+        Assert.IsNull(result.Items[1].ModelVersions![0].Images![0].Width);
+    }
+}