Hi there,
I have the same issue as those above. The game was running just fine on this Mac (Mojave OS, Intel 4000 graphics card) up until late November. Now I can get a maybe one minute of gameplay in if I'm lucky before it crashes. Tried reinstalling both the game, and Origin with no luck. Also tried installing Legacy. Here is the most recent "lastcrash.txt". Hope you will be able to find a solution as I'm at the end of the road with this :/
<?xml version="1.0" encoding="UTF-8"?><report><version>2</version><sessionid>f0ca7cbe09a2a3f65dffe556</sessionid><type>crash</type><sku>ea.maxis.sims4.15.mac</sku><createtime>2019-12-22 21:53:47</createtime><buildsignature>Local.Unknown.Unknown.1.59.73.1220-1.200.000.432.Release</buildsignature><systemconfig></systemconfig><categoryid> 0x61c2</categoryid><stack> 0x61c2 0x6dc43 0x8dca4 0x6b2c3 0x6c0c3 0x10f49bd 0x10f93e9 0x10b38dd 0x10b2e99 0x10b2dd9 0xfdc445 0xe447e8 0x3545 0x2282 0x2261 0x66556 0x5aa35 0x5a5e8 0x5a11d 0x3b6c4 0x3abe6 0xab35 0xa86b 0xa5e8</stack><threads></threads><screenshot></screenshot><memdump></memdump><contextdata>Client Session Time: 148.26<br />Num Save Errors: 0<br />Num Load Errors: 0<br />Current Game State: 0xbe7da869<br />Origin Version: 10,5,57,35162<br />Modded: False<br />SystemInfo: Mac OS X Version 10.14.1 (Build 18B75) GPU: Intel HD Graphics 4000 macOS Metal driver 0.0.0.0<br />(baseaddr) 0x7fff76084000,'libsystem_platform.dylib' 0x7fff53bcc000,'QuartzCore' 0x7fff48bca000,'CoreFoundation' 0x7fff53bcc000,'QuartzCore' 0x7fff53bcc000,'QuartzCore' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x103400000,'The Sims 4' 0x7fff4af6d000,'Foundation' 0x7fff48bca000,'CoreFoundation' 0x7fff48bca000,'CoreFoundation' 0x7fff48bca000,'CoreFoundation' 0x7fff48bca000,'CoreFoundation' 0x7fff48bca000,'CoreFoundation' 0x7fff47e86000,'HIToolbox' 0x7fff47e86000,'HIToolbox' 0x7fff47e86000,'HIToolbox'(/baseaddr)</contextdata></report>