diff --git a/src/main/kotlin/io/github/mojira/arisa/Executor.kt b/src/main/kotlin/io/github/mojira/arisa/Executor.kt
index a5430687..bcfd4bdb 100644
--- a/src/main/kotlin/io/github/mojira/arisa/Executor.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/Executor.kt
@@ -130,11 +130,17 @@ private fun getSearchResultsFromJira(
 
     return searchResult
         .issues
-        .map {
-            it.toDomain(
-                jiraClient,
-                ProjectCache.getProjectFromTicketId(it.key),
-                config
-            )
+        .mapNotNull {
+            @Suppress("TooGenericExceptionCaught")
+            try {
+                it.toDomain(
+                    jiraClient,
+                    ProjectCache.getProjectFromTicketId(it.key),
+                    config
+                )
+            } catch (exception: Exception) {
+                log.error("Error mapping bug report ${it.key}:" + exception.message + "\n" + exception.stackTrace)
+                null
+            }
         }
 }
diff --git a/src/main/kotlin/io/github/mojira/arisa/domain/Comment.kt b/src/main/kotlin/io/github/mojira/arisa/domain/Comment.kt
index f12048d5..fd4b3a62 100644
--- a/src/main/kotlin/io/github/mojira/arisa/domain/Comment.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/domain/Comment.kt
@@ -5,7 +5,7 @@ import java.time.Instant
 data class Comment(
     val id: String,
     val body: String?,
-    val author: User,
+    val author: User?,
     val getAuthorGroups: () -> List<String>?,
     val created: Instant,
     val updated: Instant,
diff --git a/src/main/kotlin/io/github/mojira/arisa/modules/CommandModule.kt b/src/main/kotlin/io/github/mojira/arisa/modules/CommandModule.kt
index ef7716f5..a2d74dc0 100644
--- a/src/main/kotlin/io/github/mojira/arisa/modules/CommandModule.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/modules/CommandModule.kt
@@ -98,7 +98,7 @@ class CommandModule(
     ) {
         val issueKey = issue.key
         val commentId = comment.id
-        val user = comment.author.name
+        val user = comment.author?.name
         val commandStr = command.command
         commandResult.fold(
             { exception ->
@@ -162,7 +162,7 @@ class CommandModule(
     private fun userIsVolunteer(comment: Comment): Boolean {
         // Ignore comments from the bot itself to prevent accidental infinite recursion and command
         // injection by malicious user
-        if (ignoreOwnCommands && comment.author.name == botUserName) {
+        if (ignoreOwnCommands && comment.author?.name == botUserName) {
             return false
         }
 
diff --git a/src/main/kotlin/io/github/mojira/arisa/modules/HideImpostorsModule.kt b/src/main/kotlin/io/github/mojira/arisa/modules/HideImpostorsModule.kt
index b858b45a..73baf8b5 100644
--- a/src/main/kotlin/io/github/mojira/arisa/modules/HideImpostorsModule.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/modules/HideImpostorsModule.kt
@@ -30,7 +30,7 @@ class HideImpostorsModule : Module {
         .plus(1, ChronoUnit.DAYS)
         .isAfter(Instant.now())
 
-    private fun userContainsBrackets(comment: Comment) = with(comment.author.displayName) {
+    private fun userContainsBrackets(comment: Comment) = with(comment.author?.displayName) {
         this != null && matches("""\[(?:\p{L}|\p{N}|\s)+]\s.+""".toRegex())
     }
 
diff --git a/src/main/kotlin/io/github/mojira/arisa/modules/RemoveBotCommentModule.kt b/src/main/kotlin/io/github/mojira/arisa/modules/RemoveBotCommentModule.kt
index f906ebf0..32eb0a1b 100644
--- a/src/main/kotlin/io/github/mojira/arisa/modules/RemoveBotCommentModule.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/modules/RemoveBotCommentModule.kt
@@ -38,7 +38,7 @@ class RemoveBotCommentModule(
             listOf("staff", "global-moderators").contains(comment.visibilityValue)
 
     private fun shouldBeRemoved(comment: Comment) =
-        comment.author.name == botUserName &&
+        comment.author?.name == botUserName &&
             isVolunteerRestricted(comment) &&
             comment.body.equals(removalTag)
 }
diff --git a/src/main/kotlin/io/github/mojira/arisa/modules/ReopenAwaitingModule.kt b/src/main/kotlin/io/github/mojira/arisa/modules/ReopenAwaitingModule.kt
index d6f109fe..33bcee9f 100644
--- a/src/main/kotlin/io/github/mojira/arisa/modules/ReopenAwaitingModule.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/modules/ReopenAwaitingModule.kt
@@ -69,7 +69,7 @@ class ReopenAwaitingModule(
             // regular users can reopen and have commented OR
             (!onlyOp && isSoftAR) ||
             // reporter has commented
-            validComments.any { it.author.name == reporter?.name }
+            validComments.any { it.author?.name == reporter?.name }
     }
 
     private fun isOPTag(comment: Comment) = comment.visibilityType == "group" &&
@@ -80,7 +80,7 @@ class ReopenAwaitingModule(
         comment.visibilityValue == "staff" &&
         (comment.body?.contains(keepARTag) ?: false)
 
-    private fun isKeepARMessage(comment: Comment, project: Project) = comment.author.name == "arisabot" &&
+    private fun isKeepARMessage(comment: Comment, project: Project) = comment.author?.name == "arisabot" &&
         (
             comment.body?.contains(
                 HelperMessageService.getMessageWithBotSignature(
@@ -99,7 +99,7 @@ class ReopenAwaitingModule(
         lastRun: Instant
     ): List<Comment> = comments
         .filter { it.created.isAfter(resolveTime) && it.created.isAfter(lastRun) }
-        .filter { !it.author.isNewUser() || it.author.name == reporter?.name }
+        .filter { it.author != null && (!it.author.isNewUser() || it.author.name == reporter?.name) }
         .filter {
             val roles = it.getAuthorGroups()
             roles == null || roles.intersect(blacklistedRoles).isEmpty()
diff --git a/src/main/kotlin/io/github/mojira/arisa/modules/ShadowbanModule.kt b/src/main/kotlin/io/github/mojira/arisa/modules/ShadowbanModule.kt
index 20258d11..9c7a300f 100644
--- a/src/main/kotlin/io/github/mojira/arisa/modules/ShadowbanModule.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/modules/ShadowbanModule.kt
@@ -59,9 +59,9 @@ class ShadowbanModule : Module {
     private fun Issue.checkCommentsForShadowban(timeframe: ExecutionTimeframe): Int =
         comments
             .filter { it.isNotStaffRestricted() }
-            .filter { it.author.isNotVolunteer() }
+            .filter { it.author != null && it.author.isNotVolunteer() }
             .filter {
-                timeframe.shadowbans[it.author.name]?.banTimeContains(it.created) ?: false
+                timeframe.shadowbans[it.author?.name]?.banTimeContains(it.created) ?: false
             }
             .map { it.restrict("${it.body}\n\n_Removed by Arisa -- User is shadowbanned_") }
             .size
diff --git a/src/main/kotlin/io/github/mojira/arisa/modules/commands/DeleteCommentsCommand.kt b/src/main/kotlin/io/github/mojira/arisa/modules/commands/DeleteCommentsCommand.kt
index 342fbd92..51c38df7 100644
--- a/src/main/kotlin/io/github/mojira/arisa/modules/commands/DeleteCommentsCommand.kt
+++ b/src/main/kotlin/io/github/mojira/arisa/modules/commands/DeleteCommentsCommand.kt
@@ -14,7 +14,7 @@ class DeleteCommentsCommand {
     operator fun invoke(issue: Issue, userName: String): Int {
         val comments = issue.comments
             .filter { it.visibilityValue != "staff" }
-            .filter { it.author.name == userName }
+            .filter { it.author?.name == userName }
 
         Thread {
             comments