diff --git a/code/controllers/subsystems/processing/chemistry.dm b/code/controllers/subsystems/processing/chemistry.dm
index 129cd827e8..7f4fd9c42b 100644
--- a/code/controllers/subsystems/processing/chemistry.dm
+++ b/code/controllers/subsystems/processing/chemistry.dm
@@ -8,7 +8,9 @@ PROCESSING_SUBSYSTEM_DEF(chemistry)
 	var/list/chemical_reagents = list()
 
 /datum/controller/subsystem/processing/chemistry/Recover()
-	log_debug("[name] subsystem Recover(). current_thing was: (\ref[SSchemistry.current_thing])[SSchemistry.current_thing]([SSchemistry.current_thing.type]) - currentrun: [SSchemistry.currentrun.len] vs total: [SSchemistry.processing.len]")
+	log_debug("[name] subsystem Recover().")
+	if(SSchemistry.current_thing)
+		log_debug("current_thing was: (\ref[SSchemistry.current_thing])[SSchemistry.current_thing]([SSchemistry.current_thing.type]) - currentrun: [SSchemistry.currentrun.len] vs total: [SSchemistry.processing.len]")
 	var/list/old_processing = SSchemistry.processing.Copy()
 	for(var/datum/D in old_processing)
 		if(CHECK_BITFIELD(D.datum_flags, DF_ISPROCESSING))
diff --git a/code/controllers/subsystems/processing/fastprocess.dm b/code/controllers/subsystems/processing/fastprocess.dm
index 8626b21752..bda0bb6fb6 100644
--- a/code/controllers/subsystems/processing/fastprocess.dm
+++ b/code/controllers/subsystems/processing/fastprocess.dm
@@ -6,7 +6,9 @@ PROCESSING_SUBSYSTEM_DEF(fastprocess)
 	stat_tag = "FP"
 
 /datum/controller/subsystem/processing/fastprocess/Recover()
-	log_debug("[name] subsystem Recover(). current_thing was: (\ref[SSfastprocess.current_thing])[SSfastprocess.current_thing]([SSfastprocess.current_thing.type]) - currentrun: [SSfastprocess.currentrun.len] vs total: [SSfastprocess.processing.len]")
+	log_debug("[name] subsystem Recover().")
+	if(SSfastprocess.current_thing)
+		log_debug("current_thing was: (\ref[SSfastprocess.current_thing])[SSfastprocess.current_thing]([SSfastprocess.current_thing.type]) - currentrun: [SSfastprocess.currentrun.len] vs total: [SSfastprocess.processing.len]")
 	var/list/old_processing = SSfastprocess.processing.Copy()
 	for(var/datum/D in old_processing)
 		if(CHECK_BITFIELD(D.datum_flags, DF_ISPROCESSING))
diff --git a/code/controllers/subsystems/processing/obj.dm b/code/controllers/subsystems/processing/obj.dm
index 86c8ecf18d..37f3acc7c6 100644
--- a/code/controllers/subsystems/processing/obj.dm
+++ b/code/controllers/subsystems/processing/obj.dm
@@ -5,8 +5,12 @@ PROCESSING_SUBSYSTEM_DEF(obj)
 	wait = 20
 
 /datum/controller/subsystem/processing/obj/Recover()
-	log_debug("[name] subsystem Recover(). current_thing was: (\ref[SSobj.current_thing])[SSobj.current_thing]([SSobj.current_thing.type]) - currentrun: [SSobj.currentrun.len] vs total: [SSobj.processing.len]")
+	log_debug("[name] subsystem Recover().")
+	if(SSobj.current_thing)
+		log_debug("current_thing was: (\ref[SSobj.current_thing])[SSobj.current_thing]([SSobj.current_thing.type]) - currentrun: [SSobj.currentrun.len] vs total: [SSobj.processing.len]")
 	var/list/old_processing = SSobj.processing.Copy()
 	for(var/datum/D in old_processing)
+		if(!isobj(D))
+			log_debug("[name] subsystem Recover() found inappropriate item in list: [D.type]")
 		if(CHECK_BITFIELD(D.datum_flags, DF_ISPROCESSING))
 			processing |= D
\ No newline at end of file
diff --git a/code/controllers/subsystems/processing/processing.dm b/code/controllers/subsystems/processing/processing.dm
index 0d4d157b7f..3eeff489aa 100644
--- a/code/controllers/subsystems/processing/processing.dm
+++ b/code/controllers/subsystems/processing/processing.dm
@@ -16,7 +16,9 @@ SUBSYSTEM_DEF(processing)
 	var/datum/current_thing
 
 /datum/controller/subsystem/processing/Recover()
-	log_debug("[name] subsystem Recover(). current_thing was: (\ref[SSprocessing.current_thing])[SSprocessing.current_thing]([SSprocessing.current_thing.type]) - currentrun: [SSprocessing.currentrun.len] vs total: [SSprocessing.processing.len]")
+	log_debug("[name] subsystem Recover().")
+	if(SSprocessing.current_thing)
+		log_debug("current_thing was: (\ref[SSprocessing.current_thing])[SSprocessing.current_thing]([SSprocessing.current_thing.type]) - currentrun: [SSprocessing.currentrun.len] vs total: [SSprocessing.processing.len]")
 	var/list/old_processing = SSprocessing.processing.Copy()
 	for(var/datum/D in old_processing)
 		if(CHECK_BITFIELD(D.datum_flags, DF_ISPROCESSING))
diff --git a/code/controllers/subsystems/processing/projectiles.dm b/code/controllers/subsystems/processing/projectiles.dm
index c6a7d7ec1a..e4316304ce 100644
--- a/code/controllers/subsystems/processing/projectiles.dm
+++ b/code/controllers/subsystems/processing/projectiles.dm
@@ -9,7 +9,9 @@ PROCESSING_SUBSYSTEM_DEF(projectiles)
 	var/global_iterations_per_move = 16
 
 /datum/controller/subsystem/processing/projectiles/Recover()
-	log_debug("[name] subsystem Recover(). current_thing was: (\ref[SSprojectiles.current_thing])[SSprojectiles.current_thing]([SSprojectiles.current_thing.type]) - currentrun: [SSprojectiles.currentrun.len] vs total: [SSprojectiles.processing.len]")
+	log_debug("[name] subsystem Recover().")
+	if(SSprojectiles.current_thing)
+		log_debug("current_thing was: (\ref[SSprojectiles.current_thing])[SSprojectiles.current_thing]([SSprojectiles.current_thing.type]) - currentrun: [SSprojectiles.currentrun.len] vs total: [SSprojectiles.processing.len]")
 	var/list/old_processing = SSprojectiles.processing.Copy()
 	for(var/datum/D in old_processing)
 		if(CHECK_BITFIELD(D.datum_flags, DF_ISPROCESSING))
diff --git a/code/controllers/subsystems/processing/turfs.dm b/code/controllers/subsystems/processing/turfs.dm
index 95265333de..d28f4b4809 100644
--- a/code/controllers/subsystems/processing/turfs.dm
+++ b/code/controllers/subsystems/processing/turfs.dm
@@ -3,8 +3,12 @@ PROCESSING_SUBSYSTEM_DEF(turfs)
 	wait = 20
 
 /datum/controller/subsystem/processing/turfs/Recover()
-	log_debug("[name] subsystem Recover(). current_thing was: (\ref[SSturfs.current_thing])[SSturfs.current_thing]([SSturfs.current_thing.type]) - currentrun: [SSturfs.currentrun.len] vs total: [SSturfs.processing.len]")
+	log_debug("[name] subsystem Recover().")
+	if(SSturfs.current_thing)
+		log_debug("current_thing was: (\ref[SSturfs.current_thing])[SSturfs.current_thing]([SSturfs.current_thing.type]) - currentrun: [SSturfs.currentrun.len] vs total: [SSturfs.processing.len]")
 	var/list/old_processing = SSturfs.processing.Copy()
 	for(var/datum/D in old_processing)
+		if(!isturf(D))
+			log_debug("[name] subsystem Recover() found inappropriate item in list: [D.type]")
 		if(CHECK_BITFIELD(D.datum_flags, DF_ISPROCESSING))
 			processing |= D
\ No newline at end of file