diff --git a/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationPanePreferredWidthProvider.kt b/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationPanePreferredWidthProvider.kt
index 4a119a4d8d01..dd69720a5e75 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationPanePreferredWidthProvider.kt
+++ b/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationPanePreferredWidthProvider.kt
@@ -119,7 +119,8 @@ internal class DocumentationPanePreferredWidthProvider(
     // or an actual preferred span no larger than MIN_CELL_WIDTH
     val preferredSectionWidth =
       cellPreferredSectionWidth[cell]
-      ?: min(MIN_CELL_WIDTH, cell.getPreferredSpan(View.X_AXIS).toInt().takeIf { it > 0 }?.let { it + cell.cssMargin.width } ?: MIN_CELL_WIDTH)
+      ?: min(MIN_CELL_WIDTH, cell.getPreferredSpan(View.X_AXIS).toInt().takeIf { it > 0 }?.let { it + cell.cssMargin.width }
+                             ?: MIN_CELL_WIDTH)
 
     // A cell can contain a table, so let's find out the maximum preferred size from any child table
     return max(preferredSectionWidth, getPreferredWidthForRows(cell.parent, cell2SubCells[cell]))
@@ -143,7 +144,7 @@ internal class DocumentationPanePreferredWidthProvider(
         result.add(cur)
       }
       for (i in 0 until cur.viewCount) {
-        queue.add(cur.getView(i))
+        cur.getView(i)?.let { queue.add(it) }
       }
     }
     return result
diff --git a/platform/platform-api/src/com/intellij/ui/components/JBHtmlPane.kt b/platform/platform-api/src/com/intellij/ui/components/JBHtmlPane.kt
index 75f57707a7b8..eba354dd7889 100644
--- a/platform/platform-api/src/com/intellij/ui/components/JBHtmlPane.kt
+++ b/platform/platform-api/src/com/intellij/ui/components/JBHtmlPane.kt
@@ -4,6 +4,7 @@ package com.intellij.ui.components
 import com.intellij.openapi.Disposable
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.components.service
+import com.intellij.openapi.diagnostic.thisLogger
 import com.intellij.openapi.editor.colors.EditorColorsScheme
 import com.intellij.util.containers.addAllIfNotNull
 import com.intellij.util.ui.*
@@ -169,7 +170,11 @@ open class JBHtmlPane(
 
   override fun setText(t: @Nls String?) {
     myText = t?.let { service.transpileHtmlPaneInput(it) } ?: ""
-    super.setText(myText)
+    try {
+      super.setText(myText)
+    } catch (e: Throwable) {
+      thisLogger().error("Failed to set contents of the HTML pane", e)
+    }
   }
 
   override fun setEditorKit(kit: EditorKit) {
diff --git a/platform/util/ui/src/com/intellij/util/ui/html/InlineViewEx.kt b/platform/util/ui/src/com/intellij/util/ui/html/InlineViewEx.kt
index d0415a8c61b3..864671cf5ad8 100644
--- a/platform/util/ui/src/com/intellij/util/ui/html/InlineViewEx.kt
+++ b/platform/util/ui/src/com/intellij/util/ui/html/InlineViewEx.kt
@@ -147,18 +147,26 @@ internal class InlineViewEx(elem: Element) : InlineView(elem) {
 
   private fun updatePaddingsAndMargins(force: Boolean) {
     val parentView = parent
-    val index = (0..<parentView.viewCount).firstOrNull { parentView.getView(it) === this } ?: -1
-
-    // Heuristics to determine whether we are within the same inline (e.g. <span>) element with paddings.
-    // Nested inline element insets are not supported, because hierarchy of inline elements is not preserved.
-    val prevSibling = getSibling(parentView, index, -1)
-    val nextSibling = getSibling(parentView, index, 1)
 
     val cssPadding = this.cssPadding
     val cssMargin = this.cssMargin
 
-    val startView = prevSibling?.cssPadding != cssPadding || prevSibling.cssMargin != cssMargin
-    val endView = nextSibling?.cssPadding != cssPadding || nextSibling.cssMargin != cssMargin
+    val startView: Boolean
+    val endView: Boolean
+    if (parentView == null) {
+      startView = true
+      endView = true
+    } else {
+      val index = (0..<parentView.viewCount).firstOrNull { parentView.getView(it) === this } ?: -1
+
+      // Heuristics to determine whether we are within the same inline (e.g. <span>) element with paddings.
+      // Nested inline element insets are not supported, because hierarchy of inline elements is not preserved.
+      val prevSibling = getSibling(parentView, index, -1)
+      val nextSibling = getSibling(parentView, index, 1)
+
+      startView = prevSibling?.cssPadding != cssPadding || prevSibling.cssMargin != cssMargin
+      endView = nextSibling?.cssPadding != cssPadding || nextSibling.cssMargin != cssMargin
+    }
 
     if (!force && startView == this.startView && endView == this.endView) {
       return